shania993 shania993
  • 19-09-2016
  • Chemistry
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What is the approximate pH of a .06 M solution of CH3COOH given that Ka= 1.78*10-5

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Yipes
Yipes Yipes
  • 19-09-2016
CH₃COOH ⇔ CH₃COO⁻ + H⁺

[CH₃COO⁻] = [H⁺] = x

[tex]K=\frac{|CH_{3}COO^{-}|*|H^{+}|}{|CH_{3}COOH|}=\frac{x^{2}}{|CH_{3}COOH|}\\\\ 1,78*10^{-5}=\frac{x^{2}}{0,06} \ \ |*0,06\\\\ 0,1068*10^{-5}=x^{2}\\\\ x_{1}\approx0,001 \ \land \ \ x_{2}=\approx-0,001\\\\ pH=-log|H^{+}|=-log0,001=3[/tex]
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