What is the pH of a buffer solution prepared by dissolving 0.40 mols HC3H3O2 and 0.35...

Question

Question

What is the pH of a buffer solution prepared by dissolving 0.40 mols HC3H3O2 and 0.35 mols C3H3O2- in 250 mL water? ( pKa (HC3H3O2) = 4.25 )

science chemistry

Answer 1

Answer #1

Moles of HC3H3O2 = 0.40 mol

and Moles C3H3O2- =0.35 mol

pKa (HC3H3O2) = 4.25

We know Henderson equation for buffer is pH = pKa + log [C3H3O2- / HC3H3O2]

= 4.25 + log [0.35 / 0.4 ]

= 4.25 + log (0.875) = 4.25 + (-0.05799)= 4.19

Answer 2

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