Answer to Question #170665 in Chemistry for Hyeri

Question #170665

What is the hydronium-ion concentration of a 0.03 F HCN solution?

Expert's answer

According to the equation:

Ka = [H+][CN-] / [HCN]

From here:

[H+][CN-] = Ka × [HCN]

[H+]² = Ka × [HCN]

[H+] = (Ka × [HCN])^1/2 = 4.5 × 10^-10 × 0.03 F = 3.7 × 10^-4 F

Answer: 3.7 × 10^-4 F

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