The pH of 0.1 M acetic acid (\(K_a=1.8\times10^{-5}\)) is approximately
A. 4.74
B. 2.87
C. 3.74
D. 1.00
1 answer
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Answer: B. 2.87
\([\mathrm{H^+}]=\sqrt{K_aC}=\sqrt{1.8\times10^{-6}}=1.34\times10^{-3}\) M; pH \(\approx2.87\).
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· 23 Oct 2026
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