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Measure of an acid's strength in solution
the value of log Ka is the exponent (−5), giving pKa = 5. For acetic acid, Ka = 1.8 x 10−5, so pKa is 4.7. A lower Ka corresponds to a weaker acid (an
Acid_dissociation_constant
Topics referred to by the same term
Look up PKA or pKa in Wiktionary, the free dictionary. PKA may refer to: Napaskiak Airport (IATA code), airport in Napaskiak, Alaska Professionally known
PKA
Family of enzymes
protein kinase A (PKA) is a family of serine-threonine kinases whose activity is dependent on cellular levels of cyclic AMP (cAMP). PKA is also known as
Protein_kinase_A
Atom displaced from its lattice site by an incident particle
In condensed-matter physics, a primary knock-on atom (PKA) is an atom that is displaced from its lattice site by irradiation; it is, by definition, the
PKA_(irradiation)
protein pKa calculations are used to estimate the pKa values of amino acids as they exist within proteins. These calculations complement the pKa values
Protein_pKa_calculations
American martial artist (born 1945)
American superstars of kickboxing, he was the Professional Karate Association (PKA) World Full-Contact Champion, and the Middleweight Kickboxing Champion for
Bill_Wallace_(martial_artist)
Martial arts promotion company
Professional Karate Association (PKA), later Professional Karate & Kickboxing Association, and now effective from March 1, 2022 PKA Worldwide was originally a
Professional Karate Association
Professional_Karate_Association
Kra–Dai language
Thai, or Central Thai (historically Siamese; Thai: ภาษาไทย), is a Tai language of the Kra–Dai language family. It is spoken by the Central Thai, Mon, Lao
Thai_language
American actor and kickboxer
professional kickboxer. He is a former Professional Karate Association (PKA) and Professional Karate Commission (PKC) Light Welterweight World Champion
Jerry_Trimble
Governing body for the sports of karate, kickboxing, and mixed martial arts (MMA)
issues that sent the Professional Karate Association (PKA) into decline. From 1974 until 1985, the PKA had been the most recognized worldwide kickboxing sanctioning
ISKA_(sports_governing_body)
Fungal metabolite
is a potent inhibitor of the serine/threonine kinases protein kinase A (PKA) and protein kinase C (PKC), binding in a similar manner with that of ATP
Balanol
Network simulation software
Packet Tracer is a cross-platform visual simulation tool designed by Cisco Systems that allows users to create network topologies and imitate modern computer
Packet_Tracer
American kickboxer, boxer and mixed martial arts fighter (born 1966)
(PKA, IKF, ISKA, FFKA and KICK), and is known for his boxing skills and powerful kicks. Roufus is the Global Director of Fighter Development for PKA Worldwide
Rick_Roufus
American martial artist and actor (1944–2012)
win the Professional Karate Association (PKA) Heavyweight full-contact karate title. The original 1974 PKA world champions, including Lewis (heavyweight)
Joe_Lewis_(martial_artist)
American kickboxer (born 1954)
Florida, Wilson lost a 5-round decision to Rudy Burney in a PKA sanctioned match. However, the PKA later overturned the decision for "improper procedures that
Don_Wilson_(kickboxer)
Activation of coagulation cascade
surface and reciprocal activation of FXII and PK occurs, forming FXIIa and PKa. FXIIa can initiate the coagulation cascade by cleaving and activating factor
Contact_activation_system
American kickboxer (born 1959)
He rebounded from this by winning the Professional Karate Association (PKA) World Light Heavyweight title that same year before moving up to cruiserweight
Dennis_Alexio
Chemical compound
(NaOH). The buffering region is dependent upon the pKa, and is typically +/- 1.0 pH units of the pKa. The pKa of KHP is 5.4, so its pH buffering range would
Potassium_hydrogen_phthalate
American kickboxer
full contact kickboxer and actor from Rockford, Illinois. He is a former PKA World Heavyweight Champion, ISKA Full Contact Super Heavyweight World Champion
Brad_Hefton
following weight classes: The (now defunct) Professional Karate Association (PKA) utilized the following weight classes: The ONE Championship utilizes the
Kickboxing_weight_classes
Penultimate step in the activation of mammalian spermatozoa
monophosphate (cAMP) synthesis, activating a secondary pathway. Protein kinase A (PKA), which is activated by cAMP, phosphorylates actin polymerization regulators
Capacitation
Chemical compound
(PKA). H-89, derived from H-8 (N-[2-(methylamino)ethyl]-5-isoquinoline-sulfonamide), was initially believed to act specifically as an inhibitor of PKA
H-89
Subdiscipline of chemistry, focusing on carbon compounds
groups have different pKa values and bond strengths (single, double, triple) leading to increased electrophilicity with lower pKa and increased nucleophile
Organic_chemistry
Organic ion with a negatively charged carbon atom
thermodynamically favorable (K > 1), the relationship pKa(BH) > pKa(AH) must hold. These values below are pKa values determined in dimethylsulfoxide (DMSO),
Carbanion
American YouTuber and podcaster (born 1986)
continues to maintain an online presence as the co-host of Painkiller Already (PKA), a podcast he co-founded in 2010. As of April 2025, the FPSRussia channel
FPSRussia
Province of Afghanistan
• Total 789,079 • Density 40.434/km2 (104.72/sq mi) Time zone UTC+04:30 (Afghanistan Time) Postal code 24xx ISO 3166 code AF-PKA Main languages Pashto
Paktika_Province
Aqueous solution of a weak acid and its conjugate base
value at pH = pKa ± 1, to 10% at pH = pKa ± 1.5 and to 1% at pH = pKa ± 2. For this reason, the most useful range is approximately pKa ± 1. When choosing
Buffer_solution
Property of ions and molecules
While pKa values often refer to aqueous solutions, pKa can be defined with reference to any solvent, and many weak organic acids have measured pKa values
Proton_affinity
Chemical compound
buffering agent in biology and biochemistry. It has pKa value of 6.15 at 20 °C. The pH (and pKa at ionic strength I≠0) of the buffer solution changes
MES_(buffer)
Statuary board of the government of Malaysia
Port Klang Authority (PKA) is a government agency of Malaysia that facilitates, regulates and owns the country's most important port, Port Klang, on the
Port_Klang_Authority
Chemical compound
Pseudomonas hunanensis was found to be able to degrade TRIS buffer. Since Tris's pKa is more strongly temperature dependent, its use is not recommended in biochemical
Tris
Catalysis of chemical reactions by enzymes
substantially altered pKa. This alteration of pKa is possible through the local environment of the residue.[citation needed] pKa can also be influenced
Enzyme_catalysis
Chemical added to show pH of a solution
states that when pH equals the pKa or pKb value of the indicator, both species are present in a 1:1 ratio. If pH is above the pKa or pKb value, the concentration
PH_indicator
Pair of structures in the brains of some arthropods and annelids
concentration of cAMP, which activates PKA. When dopamine, an aversive olfactory stimulant, is applied it activates PKA specifically in the vertical mushroom
Mushroom_bodies
Middle Indo-Aryan language of India
Developed into Eastern Hindi languages Language family Indo-European Indo-Iranian Indo-Aryan Ardhamagadhi Prakrit Language codes ISO 639-3 pka Glottolog None
Ardhamagadhi_Prakrit
American kickboxer (1950–2021)
first courted national attention in 1978 when he defeated Bob Ryan for the PKA version of the welterweight world championship (at 157 pounds). Six months
Steve_Shepherd
whose major intracellular receptor is the cAMP-dependent protein kinase (PKA) that acts through the phosphorylation of target proteins. The signal transduction
Crosstalk_(biology)
Different forms of a parent chemical species as a function of solution pH
that is, when [AH]/[A−] = 100, pH = pKa − 2 when the acid is 50 % dissociated, that is, when [AH]/[A−] = 1, pH = pKa when the acid is 99 % dissociated,
Ion_speciation
American novelist
Virginian. Quine also was the president of the Professional Karate Association (PKA) whose Kick of the 80’s weekly fight series on ESPN ran for close to a decade
Don_Quine
Group of structurally diverse proteins
common function of binding to the regulatory subunit of protein kinase A (PKA) and confining the holoenzyme to discrete locations within the cell. At least
A-kinase-anchoring_protein
Chemical compound
compound has attracted interest because it (pKa = 9.58) is more basic than 4-dimethylaminopyridine (pKa = 9.41). It is a popular base catalyst. Kaljurand
4-Pyrrolidinylpyridine
1980s Australian rock band
Lindsay Brunsdon (p.k.a. Lindsay Storm) on guitar and vocals, Andrew Flossos (p.k.a. Andrew Frank) on drums, Kerrie Hickin (p.k.a. Kerrie Van Lewin)
Fire_(Australian_band)
Aqueous cation H3O+
define pKa of H3O+ in water, H2O has to act simultaneously as a solute and the solvent. The IUPAC has not given an official definition of pKa that would
Hydronium
Chemical compound
TAPSO is used to make buffer solutions. It has a pKa value of 7.635 (I=0, 25°C). It can be used to make buffer solutions in the pH range 7.0-8.2. Goldberg
TAPSO
Full-contact hybrid martial art and combat sport
prominence in September 1974, when the Professional Karate Association (PKA) held the first World Championships. Historically, kickboxing can be considered
Kickboxing
National park in Indonesia
1999, Rinca's population was 835, and Kerora's population was 185 people.PKA & TNC 2000, p. 13 In 2004, the total population living in the park was 3
Komodo_National_Park
One of the lightest perfluoro compounds
while refrigerants account for around 1170 metric tonnes per year. Having a pKa value of around 0, TFA does not exist as such at concentrations found in
Trifluoroacetic_acid
Chemical compound
black powder Density 0.7 - 0.8 g/cm3 Solubility in water insoluble Acidity (pKa) 8.5 - 10.0 Except where otherwise noted, data are given for materials in
Bone_char
Protein-coding gene in humans
protein kinase A (PKA), which transduces the signal through phosphorylation of different target proteins. The inactive holoenzyme of PKA is a tetramer composed
PRKACB
Chemical compound
pathway irrespective of the anhydride used, but the mechanism changes with the pKa value of the alcohol used. For example, the reaction runs through a base-catalyzed
4-Dimethylaminopyridine
Equation used to estimate pH of a weak acid or base solution
Simulated titration of an acidified solution of a weak acid (pKa = 4.7) with alkali
Henderson–Hasselbalch equation
Henderson–Hasselbalch_equation
Chemical compound
Self-Consistent Spectrophotometric Basicity Scale in Acetonitrile to a Full Span of 28 pKa Units: Unification of Different Basicity Scales". J. Org. Chem. 70 (3): 1019–1028
1,8-Diazabicyclo(5.4.0)undec-7-ene
1,8-Diazabicyclo(5.4.0)undec-7-ene
Organic compounds containing amine and carboxylic groups
occurs halfway between the two carboxylate pKa values: pI = 1/2(pKa1 + pKa(R)), where pKa(R) is the side chain pKa. Similar considerations apply to other
Amino_acid
Chemical compound
95 Vapor pressure 0.6 mmHg (0.080 kPa) (120 °C (248 °F; 393 K)) Acidity (pKa) 7.15 Magnetic susceptibility (χ) −69.5×10−6 cm3/mol[citation needed] Hazards
4-Nitrophenol
Chemical compound
492.38 g/mol Melting point 120 °C (248 °F; 393 K) (decomposes) Acidity (pKa) 3.39, 5.78, 8.35, 10.27, 11.51 Except where otherwise noted, data are given
Carminic_acid
Buffer solution commonly used in biological research
equation gives the pH of a solution relative to the pKa of the acid–base pair. However the pKa is dependent on ionic strength and temperature, and as
Phosphate-buffered_saline
Organic compound used in sunscreen
(583–599 °F; 579–588 K) Solubility in Ethanol 13% w/w log P 1.7 Acidity (pKa) 13.3 UV-vis (λmax) 385 Except where otherwise noted, data are given for
Methoxypropylamino cyclohexenylidene ethoxyethylcyanoacetate
Methoxypropylamino_cyclohexenylidene_ethoxyethylcyanoacetate
Chemical compound
50% water ethanol mixture, the acidity constant (pKa) of Barton's base is 14. In acetonitrile its pKa is 24.31. The base is prepared by the reaction of
2-tert-Butyl-1,1,3,3-tetramethylguanidine
2-tert-Butyl-1,1,3,3-tetramethylguanidine
Chemical compound giving a proton or accepting an electron pair
constant, pKa is more frequently used, where pKa = −log10 Ka. Stronger acids have a smaller pKa than weaker acids. Experimentally determined pKa at 25 °C
Acid
Australian musical group
Daniel Young p.k.a. "Danny Current" on drums, his brother Michael Young p.k.a. "Eddy Current" on lead guitar and keyboard, Brendan Huntley p.k.a. "Brendan
Eddy_Current_Suppression_Ring
Chemical compound
129.115 g·mol−1 Melting point 184 °C (363 °F; 457 K) log P −0.89 Acidity (pKa) −1.76, 3.48, 12.76 Basicity (pKb) 15.76, 10.52, 1.24 Isoelectric point 0
Pyroglutamic_acid
Chemical compound
(99 °F; 310 K) at 2.0 kPa Solubility in water miscible log P 1.23 Acidity (pKa) 12.69 Basicity (pKb) 1.31 Refractive index (nD) 1.3870 Thermochemistry Std
Tert-Butyl_hydroperoxide
1979 compilation album by various artists
release, the Flesh Eaters consisted solely of their founder, Chris Desjardins (pka Chris D.), backed by the members of the pioneering punk rock band the Flyboys;
Tooth and Nail (various artists album)
Tooth_and_Nail_(various_artists_album)
Organic compound, provitamin
to 120 °C (244 to 248 °F; 391 to 393 K) at 2.7 Pa log P −0.989 Acidity (pKa) 13.033 Basicity (pKb) 0.964 Chiral rotation ([α]D) +29° to +30° Refractive
Panthenol
Chemical compound
Solubility in glycerol 10 g/L Solubility in propylene glycol 50 g/L Acidity (pKa) 4.10 (first), 11.6 (second) Pharmacology ATC code A11GA01 (WHO) G01AD03
Chemistry_of_ascorbic_acid
American kickboxer and martial artist
various kickboxing organizations (NKL, WPKO, Professional Karate Association (PKA), World Kickboxing Association (WKA), AJKBA, Shin-Kakutojutsu Federation
Benny_Urquidez
Anion, salt, functional group or ester derived from a phosphoric acid
two pKa values) the dihydrogen phosphate ion, H2PO4−, is practically the only species present. Around pH 9.8 (mid-way between the second and third pKa values)
Phosphate
Aromatic organic compound with formula C6H4(COOH)2
point 207 °C (405 °F; 480 K) Solubility in water 0.6 g / 100 mL Acidity (pKa) 2.89, 5.51 Magnetic susceptibility (χ) −83.61·10−6 cm3/mol Hazards GHS labelling:
Phthalic_acid
American kickboxer
PKA, ISKA and KICK organizations between 1980 and 2003. He was also the STAR undisputed lightweight champion in 1980. He was the first fighter in PKA
Cliff_Thomas_(kickboxer)
American kickboxer (born April 1952)
2002, during which he won multiple world titles in organizations like the PKA, KICK, and Professional Karate Commission. He was also the STAR undisputed
Paul_Vizzio
Mammalian protein found in Homo sapiens
When phospholamban is phosphorylated by PKA, its ability to inhibit SERCA2 is lost. Thus, activators of PKA, such as the beta-adrenergic agonist epinephrine
Phospholamban
Football club
known as Inspac Rapatona, CMSS Rapatona Tigers, Moresby Casino Hotel and PKA Rapatona for sponsorship reasons, was a Papua New Guinean soccer club based
Rapatona_F.C.
Permanent bond dipole due to electron-rich or -poor groups in a molecule
acidity, they do not by themselves predict all pKa relationships. For example, fluoroacetic acid (pKa ≈ 2.6), which contains a single strongly electron-withdrawing
Inductive_effect
Chemical indicator that turns red in acidic solutions
red in pH under 4.4, yellow in pH over 6.2, and orange in between, with a pKa of 5.1. Murexide and methyl red are investigated as promising enhancers of
Methyl_red
Combination of hydrogen and ionic bonding in chemistry
or ammonium group. The midpoint of the titration curve corresponds to the pKa, or the pH where the ratio of protonated: deprotonated molecules is 1:1.
Salt_bridge_(protein)
Organic compound and major metabolic intermediate
in alcohol, pyridine, NaOH insoluble in ethyl ether log P −3.14 Acidity (pKa) 8.48 Hazards NFPA 704 (fire diamond) 2 1 0 Lethal dose or concentration
Allantoin
Chemical compound of hydrogen and oxygen
Silverstein TP, Heller ST (17 April 2017). "pKa Values in the Undergraduate Curriculum: What Is the Real pKa of Water?". Journal of Chemical Education.
Water
Chemical compound
water Solubility in other solvents Soluble in alcohol, chloroform Acidity (pKa) 6.35 Hazards Flash point 110 °C (230 °F; 383 K) Except where otherwise noted
Tetramethylphenylenediamine
Chemical compound
species (RNS). It is the conjugate acid of peroxynitrite (ONOO−). It has a pKa of approximately 6.8. It is formed in vivo from the diffusion-controlled
Peroxynitrous_acid
Railway station in Dhanbad district, Jharkhand, India
Pradhankhunta Junction railway station (station code: PKA) is a railway station located in the Dhanbad district of the Indian state of Jharkhand. It falls
Pradhankhunta Junction railway station
Pradhankhunta_Junction_railway_station
American kickboxer
professional boxer from Memphis, Tennessee. He was a PKA World Super Heavyweight Champion, PKA World Heavyweight champion, Professional Karate Commission
Anthony_Elmore
Chemical compound
medium and yellow color in basic medium. Because it changes color at the pKa of a mid strength acid, it is usually used in titration of strong acids in
Methyl_orange
Chemical compound
pressure 24.2–97.5 kPa Henry's law constant (kH) 150 μmol Pa−1 kg−1 Acidity (pKa) 10.98 (of ammonium form) Magnetic susceptibility (χ) −56.8·10−6 cm3/mol
Diethylamine
9-Carbon fatty acid
Critical point (T, P) 439 °C (712 K), 2.35 MPa Solubility in water 0.3 g/L Acidity (pKa) 4.96 1.055 at 2.06–2.63 K (−271.09 – −270.52 °C; −455.96 – −454.94 °F) 1
Pelargonic_acid
Chemical compound
Solubility in water miscible Solubility very soluble in alcohol, ether Acidity (pKa) 0.89±0.05 Conjugate base Phosphinate Structure Molecular shape pseudo-tetrahedral
Hypophosphorous_acid
Group of chemical compounds
point 191.0 °C (464.2 K) 202.0 °C (475.2 K) 201.9 °C (475.1 K) Acidity (pKa) 10.287 10.09 10.26 Viscosity solid at 25 °C ? cP at 25 °C solid at 25 °C
Cresol
Chemical compound
hydrochloride is one of Good's buffers with a pH in the physiological range. Its pKa at 20°C is 7.10, making it useful in cell culture work. Its ΔpKa/°C is -0
Cholamine chloride hydrochloride
Cholamine_chloride_hydrochloride
Central nervous system stimulant
because Gs-cAMP-PKA signaling functionally inhibits RhoA's downstream activity; once intracellular cAMP sufficiently accumulates, PKA is activated and
Amphetamine
Group of biological receptors
enzyme with a coenzyme. The PKA enzyme also contains two catalytic PKS-Cα subunits, and a regulator PKA-R subunit dimer. The PKA holoenzyme is inactive under
Opioid_receptor
Cellular second messenger
eukaryotes, cyclic AMP works by activating protein kinase A (PKA, or cAMP-dependent protein kinase). PKA is normally inactive as a tetrameric holoenzyme, consisting
Cyclic adenosine monophosphate
Cyclic_adenosine_monophosphate
Organic compound
(637 °F; 609 K) sublimes Solubility in water <0.1 g/100 ml (19.5 °C) Acidity (pKa) 8.3 Basicity (pKb) 5.7 Magnetic susceptibility (χ) −78.4×10−6 cm3/mol Related
Phthalimide
American kickboxer
Bill Morrison is a retired American karate and kickboxer, who was the PKA U.S. Heavyweight and Super-Heavyweight Champion from 1984 to 1985 and #1 contender
Bill_Morrison_(kickboxer)
Chemical compound
Molar mass 267.285 g·mol−1 Melting point 203 °C (397 °F; 476 K) Acidity (pKa) 3.4 Hazards Occupational safety and health (OHS/OSH): Main hazards Toxic
Agaritine
Chemical group (R–O)
cations Na+. Alkoxides are strong bases and nucleophiles. For example, the pKa of ethanol is 15.9. Certain alkoxy groups may be made less basic by factors
Alkoxy_group
Chemical compound
311 °C (590 to 592 °F; 583 to 584 K) Solubility in water 12.9 g/L Acidity (pKa) 7.61 (25 °C) Magnetic susceptibility (χ) −78.0·10−6 cm3/mol Refractive index
4-Hydroxybenzaldehyde
Ionic compound made of a C2H5–O anion and a sodium cation
533 K) Solubility in water Reacts Solubility ethanol and methanol Acidity (pKa) 15.5 Hazards GHS labelling: Pictograms ‹ The template below (GHS flame)
Sodium_ethoxide
Australian band
which consists of DJs and record producers, Ben Garden and Rob Kittler (p.k.a. RobKAY). In 2005 their remix, "Star2Fall", of Boy Meets Girl's 1988 single
Cabin_Crew
Chemical compound
corrosive. Peracetic acid is a weaker acid than the parent acetic acid, with a pKa of 8.2. Peracetic acid is produced industrially by the autoxidation of acetaldehyde:
Peracetic_acid
Chemical compound
dissociation constant, a measure of basicity) is 11.07 at 25 °C, while its pKa (acid dissociation constant, a measure of acidity) is approximately 37. Many
2,2,6,6-Tetramethylpiperidine
Chemical compound
acid, a superacid, is one of the strongest Brønsted–Lowry acids. That its pKa is lower than −9 is evidenced by the fact that its monohydrate contains discrete
Perchloric_acid
travel, tourism, insurance
PKA
PKA
PKA
PKA
PKA
PKA
PKA
PKA
PKA
travel, tourism, insurance