A sample of carbonic acid, H₂CO₃ ( ; )

CHEMISTRY · Subjective · A Level · Chemistry · Acids and bases · Acids and bases

Problem

50.0\,\text{mL}

sample of

0.0500\,\text{M}

carbonic acid, H₂CO₃ (

K_{a1} = 4.3\times10^{-7}

;

K_{a2} = 5.6\times10^{-11}

), is combined with

50.0\,\text{mL}

0.0500\,\text{M}

methylamine, CH₃NH₂ (

K_{b} = 4.4\times10^{-4}

), at

25\,\text{°C}

. Considering only the first dissociation of H₂CO₃, determine the pH of the resulting solution.