Weak Acid pH — Approximation vs Exact

Current solution

Acid—

Ka—

pKa—

[HA]₀—

pH, approximation—

pH, exact—

% dissociated (exact)—

Approximation—

pH vs initial concentration [HA]₀ (log scale), at the current pKa

Approximation: [H⁺]=[A⁻], [HA]=[HA]₀ Exact (full charge balance)

[H⁺] approx—

[H⁺] exact—

Difference in pH—

Difference in [H⁺]—

Preset acid

pKa4.76

[HA]₀0.100 mol dm⁻³