If concentrations of acid and salt in the CH3COOH/CH3COONa buffer solution are equal, pH of the buffer solution is about..?

Solution

Thus the pH of the buffer solution is about 4.76

Explanation:

Having the equation of buffer:

pH = pKa + log(A-/HA)

but concentrations of acid and salt are equal,

then,log(A-/HA) = 0

We also know that the pKa for CH3COOH = 4.76

Thus pH = 4.76+0 = 4.76

Thus the pH of the buffer solution is about 4.76

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