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What are the [H3O+] and the pH of a propanoic acid—propanoate buffer that consists of 0.36...

What are the [H3O+] and the pH of a propanoic acid—propanoate buffer that consists of 0.36 M CH3CH2COONa and 0.10 M CH3CH2COOH? (Ka of propanoic acid = 1.3 10-5)

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