Octet / Collection
pKa
Acids ranked by strength, with the conjugate base each one leaves behind.
1-31 of 31 records
All pKa
Acids ranked by strength, with the conjugate base each one leaves behind.
HI
The pKa of HI is -10. Strongest common acid. A lower pKa means a stronger acid and a more stable conjugate base.
HBr
The pKa of HBr is -9. A lower pKa means a stronger acid and a more stable conjugate base.
HCl
The pKa of HCl is -7. A lower pKa means a stronger acid and a more stable conjugate base.
H₂SO₄
The pKa of H₂SO₄ is -3. First proton. A lower pKa means a stronger acid and a more stable conjugate base.
HNO₃
The pKa of HNO₃ is -1.4. A lower pKa means a stronger acid and a more stable conjugate base.
H₃O⁺
The pKa of H₃O⁺ is -1.7. Hydronium ion. A lower pKa means a stronger acid and a more stable conjugate base.
HSO₄⁻
The pKa of HSO₄⁻ is 2. Second proton of H₂SO₄. A lower pKa means a stronger acid and a more stable conjugate base.
HF
The pKa of HF is 3.2. Weak due to strong H-F bond. A lower pKa means a stronger acid and a more stable conjugate base.
RCOOH (carboxylic acid)
The pKa of RCOOH (carboxylic acid) is 4-5. Resonance-stabilized anion. A lower pKa means a stronger acid and a more stable conjugate base.
Acetic acid (CH₃COOH)
The pKa of Acetic acid (CH₃COOH) is 4.76. A lower pKa means a stronger acid and a more stable conjugate base.
Benzoic acid
The pKa of Benzoic acid is 4.2. A lower pKa means a stronger acid and a more stable conjugate base.
H₂CO₃
The pKa of H₂CO₃ is 6.4. Carbonic acid. A lower pKa means a stronger acid and a more stable conjugate base.
H₂S
The pKa of H₂S is 7. A lower pKa means a stronger acid and a more stable conjugate base.
NH₄⁺
The pKa of NH₄⁺ is 9.2. Ammonium ion. A lower pKa means a stronger acid and a more stable conjugate base.
HCN
The pKa of HCN is 9.2. Hydrogen cyanide. A lower pKa means a stronger acid and a more stable conjugate base.
Phenol (ArOH)
The pKa of Phenol (ArOH) is 10. Resonance into ring stabilizes anion. A lower pKa means a stronger acid and a more stable conjugate base.
RSH (thiol)
The pKa of RSH (thiol) is 10-11. More acidic than alcohol. A lower pKa means a stronger acid and a more stable conjugate base.
RNH₃⁺
The pKa of RNH₃⁺ is 10-11. Protonated amine. A lower pKa means a stronger acid and a more stable conjugate base.
H₂O
The pKa of H₂O is 15.7. A lower pKa means a stronger acid and a more stable conjugate base.
ROH (alcohol)
The pKa of ROH (alcohol) is 16-18. A lower pKa means a stronger acid and a more stable conjugate base.
Ethanol
The pKa of Ethanol is 16. A lower pKa means a stronger acid and a more stable conjugate base.
t-Butanol
The pKa of t-Butanol is 18. Bulky, less acidic. A lower pKa means a stronger acid and a more stable conjugate base.
Acetone (α-H)
The pKa of Acetone (α-H) is 20. Enolizable. A lower pKa means a stronger acid and a more stable conjugate base.
Ethyl acetate (α-H)
The pKa of Ethyl acetate (α-H) is 25. Ester enolate. A lower pKa means a stronger acid and a more stable conjugate base.
Acetylene (≡C-H)
The pKa of Acetylene (≡C-H) is 25. Terminal alkyne. A lower pKa means a stronger acid and a more stable conjugate base.
Acetonitrile (α-H)
The pKa of Acetonitrile (α-H) is 25. A lower pKa means a stronger acid and a more stable conjugate base.
H₂ (dihydrogen)
The pKa of H₂ (dihydrogen) is 35. A lower pKa means a stronger acid and a more stable conjugate base.
NH₃
The pKa of NH₃ is 38. A lower pKa means a stronger acid and a more stable conjugate base.
RNH₂ (amine)
The pKa of RNH₂ (amine) is 35-40. A lower pKa means a stronger acid and a more stable conjugate base.
Alkene (=CH)
The pKa of Alkene (=CH) is ~44. A lower pKa means a stronger acid and a more stable conjugate base.
Alkane (C-H)
The pKa of Alkane (C-H) is ~50. Essentially non-acidic. A lower pKa means a stronger acid and a more stable conjugate base.
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