updated pka values
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Last updated 1:01 PM on 11/23/25
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25 Terms
1
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HI
pKa ≈ –10
2
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HBr
pKa ≈ –9
3
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HCl
pKa ≈ –7
4
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Sulfonic acids (HO–S(=O)₂–R)
pKa ≈ –6 to –7
5
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H₂SO₄ (1st proton)
pKa ≈ –5
6
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Protonated alcohols (R–OH₂⁺)
pKa ≈ –3
7
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Protonated carbonyls (R–O⁺H₂)
pKa ≈ –2
8
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H₃O⁺
pKa ≈ –1.7
9
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HF
pKa = 3.2
10
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Carboxylic acids
pKa = 4–5
11
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HN₃
pKa = 4.6
12
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Pyridinium (protonated pyridine)
pKa = 5.2
13
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HCN
pKa = 9.2
14
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NH₄⁺
pKa = 9.4
15
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Protonated amines (RNH₃⁺, R₂NH₂⁺, R₃NH⁺)
pKa = 9–10
16
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Phenol
pKa = 10
17
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Thiols (R–SH)
pKa ≈ 11
18
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Alcohols (R–OH)
pKa = 15–18
19
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Water
pKa = 15.7
20
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Terminal alkynes (R–C≡C–H)
pKa = 25
21
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H₂
pKa = 35
22
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NH₃
pKa = 36
23
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Amines (R–NH₂)
pKa ≈ 40
24
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Alkenes (H₂C=CH₂)
pKa = 44
25
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Alkanes (R–CH₃)
pKa ≈ 60
Note 
Flashcards (24)