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acidity-constant-ka-for-some-acidic-substances
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The Acidity Constant (Ka)
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Secondary V
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Chemistry
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Below is an exhaustive list of the acidity constants for some acidic substances at 25 °C, as well as the formula for their conjugate base.

Acid name Formula Conjugate base |K_{a}|
Acetic acid |CH_{3}COOH| |CH_{3}COO^{-}| |1.8\times 10^{-5}|
Acrylic acid |CH_{2}CHCOOH| |CH_{2}CHCOO^{-}| |5.5\times 10^{-5}|
Arsenious acid |H_{3}AsO_{3}| |H_{2}AsO_{3}^{-}| |6.6\times 10^{-10}|
Arsenic acid |H_{3}AsO_{4}| |H_{2}AsO_{4}^{-}| |6.0\times 10^{-3}|
Benzoic acid |C_{6}H_{5}COOH| |C_{6}H_{5}COO^{-}| |6.3\times 10^{-5}|
Bromoacetic acid |CH_{2}BrCOOH| |CH_{2}BrCOO^{-}| |1.3\times 10^{-3}|
Butanoic acid |CH_{3}CH_{2}CH_{2}COOH| |CH_{3}CH_{2}CH_{2}COO^{-}| |1.5\times 10^{-5}|
Carbonic acid |H_{2}CO_{3}| |HCO_{3}^{-}| |4.4\times 10^{-7}|
Chlorous acid |HClO_{2}| |ClO_{2}^{-}| |1.1\times 10^{-2}|
Chloroacetic acid |CH_{2}ClCOOH| |CH_{2}ClCOO^{-}| |1.4\times 10^{-3}|
Hydrocyanic acid |HCN| |CN^{-}| |6.2\times 10^{-10}|
Cyanic acid |HOCN| |OCN^{-}| |3.5\times 10^{-4}|
Dichloroacetic acid |CHCl_{2}COOH| |CHCl_{2}COO^{-}| |5.5\times 10^{-2}|
Hydrofluoric acid |HF| |F^{-}| |6.6\times 10^{-4}|
Fluoroacetic acid |CH_{2}FCOOH| |CH_{2}FCOO^{-}| |2.6\times 10^{-3}|
Formic acid |HCOOH| |HCOO^{-}| |1.8\times 10^{-4}|
Hydrazoic acid |HN_{3}| |N_{3}^{-}| |1.9\times 10^{-5}|
Hypobromous acid |HBrO| |BrO^{-}| |2.5\times 10^{-9}|
Hypochlorous acid |HClO| |ClO^{-}| |2.9\times 10^{-8}|
Hypoiodous acid |HIO| |IO^{-}| |2.3\times 10^{-11}|
Hyponitrous acid |HON=NOH| |HON=NO^{-}| |8.9\times 10^{-8}|
Iodic acid |HIO_{3}| |IO_{3}^{-}| |1.6\times 10^{-1}|
Iodoacetic acid |CH_{2}ICOOH| |CH_{2}ICOO^{-}| |6.7\times 10^{-4}|
Malonic acid |HO_{2}CCH_{2}COOH| |HO_{2}CCH_{2}COO^{-}| |1.5\times 10^{-3}|
Nitrous acid |HNO_{2}| |NO_{2}^{-}| |7.2\times 10^{-4}|
Oxalic acid |HO_{2}CCOOH| |HO_{2}CCOO^{-}| |5.4\times 10^{-2}|
Phenylacetic acid |C_{6}H_{5}CH_{2}COOH| |C_{6}H_{5}CH_{2}COO^{-}| |4.9\times 10^{-5}|
Phosphorous acid |H_{3}PO_{3}| |H_{2}PO_{3}^{-}| |3.7\times 10^{-2}|
Phosphoric acid |H_{3}PO_{4}| |H_{2}PO_{4}^{-}| |7.1\times 10^{-3}|
Propanoic acid |CH_{3}CH_{2}COOH| |CH_{3}CH_{2}COO^{-}| |1.3\times 10^{-5}|
Pyrophosphoric acid |H_{4}P_{2}O_{7}| |H_{3}P_{2}O_{7}^{-}| |3.0\times 10^{-2}|
Hydroselenic acid |H_{2}Se| |HSe^{-}| |1.3\times 10^{-4}|
Selenious acid |H_{2}SeO_{3}| |HSeO_{3}^{-}| |2.3\times 10^{-3}|
Selenic acid |H_{2}SeO_{4}^{-}| |HSeO_{4}^{-2}| |2.2\times 10^{-2}|
Succinic acid |HO_{2}CCH_{2}CH_{2}COOH| |HO_{2}CCH_{2}CH_{2}COO^{-}| |6.2\times 10^{-5}|
Hydrosulphuric acid |H_{2}S| |HS^{-}| |1.0\times 10^{-7}|
Sulphurous acid |H_{2}SO_{3}| |HSO_{3}^{-}| |1.3\times 10^{-2}|
Hydrogen sulfate ion |HSO_{4}^{-}| |SO_{4}^{-2}| |1.1\times 10^{-2}|
Trichloroacetic acid |CCl_{3}COOH| |CCl_{3}COO^{-}| |3.0\times 10^{-1}|
Hydrogen peroxide |H_{2}O_{2}| |HO_{2}^{-}| |2.2\times 10^{-12}|
Phenol |C_{6}H_{5}OH| |C_{6}H_{5}O^{-}| |1.0\times 10^{-10}|
Thiophenol |C_{6}H_{5}SH| |C_{6}H_{5}S^{-}| |3.2\times 10^{-7}|
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