Conjugate Acid-Base Pairs

Strong Acid;

pairs with ClO₄⁻

HClO₄

Strong Acid that pairs with Cl⁻

HCl

Strong Acid that pairs with HSO₄⁻

H₂SO₄

Strong Acid that pairs with NO₃⁻

HNO₃

Weak Acid that pairs with SO₄²⁻

HSO₄⁻

Weak Acid that pairs with H₂PO₄⁻

H₃PO₄

Weak Acid that pairs with NO₂⁻

HNO₂

Weak Acid that pairs with F⁻

HF

Weak Acid that pairs with CH₃CO₂⁻

CH₃CO₂H

Weak Acid that pairs with HCO₃⁻

H₂CO₃

Weak Acid that pairs with HS⁻

H₂S

Weak Acid that pairs with NH₃

NH₄⁺

Weak Acid that pairs with CN⁻

HCN

Weak Acid that pairs with CO₃²⁻

HCO₃⁻

Acid and Base

H₂O

Very Weak Acid that pairs with NH²⁻

NH₃

Very Weak Acid that pairs with O²⁻

OH⁻

Very Weak Acid that pairs with H⁻

H₂

Very Weak Base that pairs with HClO₄

ClO₄⁻

Very Weak Base that pairs with HCl

Cl⁻

Very Weak Base that pairs with H₂SO₄

HSO₄⁻

Very Weak Base that pairs with HNO₃

NO₃⁻

Weak Bases that pairs with HSO₄⁻

SO₄²⁻(Weak Base)

Weak Base that pairs with H₃PO₄

H₂PO₄⁻

Weak Base that pairs with HNO₂

NO₂⁻

Weak Base that pairs with HF

F⁻

Weak Base that pairs with CH₃CO₂H

CH₃CO₂⁻

Weak Base that pairs with H₂CO₃

HCO₃⁻

Weak Base that pairs with H₂S

HS⁻

Weak Base that pairs with NH₄⁺

NH₃

Weak Base that pairs with HCN

CN⁻

Weak Base that pairs with HCO₃⁻

CO₃²⁻

Strong Base that pairs with NH₃

NH₂⁻

Strong Base that pairs with OH⁻

O²⁻

Strong Base that pairs with H₂

H⁻

Strong Acids

100% dissociated in aqueous solution

Weak Acids

Exist in solution as a mixture of HA, A⁻ and H₃O⁺

Strong Bases

100% protonated in aqueous solution.

Weak Bases

Moderate tendency to be protonated in aqueous solution.