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25-11-2017
Chemistry

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If acetic acid is the only acid that vinegar contains (ka=1.8×10−5), calculate the initial concentration of acetic acid in the vinegar. express your answer using two significant figures.

Respuesta :

07-12-2017

CH3COOH ---> CH3COO- + H+ X X pH = -log [H+] 3.15 = -log [H+] [H+] = 7.08*10^-4 M so, x = 7.08*10^-4 M Ka = [CH3COO-] [H+] / [CH3COOH] 1.8*10^-5 = x*x / [CH3COOH] 1.8*10^-5 = (7.08*10^-4)*(7.08*10^-4) / [CH3COOH] [CH3COOH] = 0.028 M Answer: 0.028 M

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