What is the pH of a buffer solution prepared by mixing 100 mL of 0,2 M ethanoic acid (acetic acid, K a = 1, 8 x 10 -5) with 100 mL of 0,2 M sodium ethanoate? (Take - log 10 (1, 8) approx -0, 26, so pK a approx 4, 74)

What is the pH of a buffer solution prepared by mixing 100 mL of 0,2 M ethanoic acid (acetic acid, $K_{a} = 1, 8 \times 1 0^{- 5}$ ) with 100 mL of 0,2 M sodium ethanoate? (Take $- lo g_{10} (1, 8) \approx - 0, 26$ , so $p K_{a} \approx 4, 74$ )

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