Use a mathematical solution to determine the pH of a solution containing 10-2 M propionic acid...

Use a mathematical solution to determine the pH of a solution containing 10^-2 M propionic acid (C₂H₅COOH; pKa = 4.88).

Solutions

Expert Solution

pKa = 4.88

Ka = 10^-4.88 = 1.32 x 10^-5

C2H5COOH ---------------> C2H5COO- + H+

10^-2 0 0

10^-2 - x x x

Ka = [C2H5COO- ][H+] / [C2H5COOH]

1.32 x 10^-5 = x^2 / 10^-2 - x

x = 3.57 x 10^-4

[H+] = 3.57 x 10^-4 M

pH = -log (3.57 x 10^-4)

pH = 3.45

queen_honey_blossom answered 1 year ago

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