The pK_a of acetic acid and pK_b of ammonium hydroxide are 4·76 and 4·75 respectively. Calculate the pH of ammonium acetate solution.

Solution

We know

space space pH space equals space 7 plus 1 half open square brackets pK subscript straight a space minus space pK subscript straight b close square brackets space space space space... left parenthesis 1 right parenthesis Here comma space pK subscript straight a space equals space 4.76 semicolon space space space pK subscript straight b space equals space 4.75 Putting space the space values space in space expression left parenthesis 1 right parenthesis comma space we space have space space space pH space equals space 7 plus 1 half left square bracket 4.76 space minus space 4.75 right square bracket space space space space space space space equals space 7 plus 1 half left parenthesis 0.01 right parenthesis space equals space 7 plus 0.005 space equals space 7.005

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