What is the pH of a 0.10 M HCN solution? K _a(HCN) = 4.9×10^{- 10}

Name: What is the pH of a 0.10 M HCN solution? K a (HCN) = 4.9×10 - 10
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HCN is a weak acid, and its pH can be calculated using the formula pH = -log[H+]. First, calculate [H+] using the expression for weak acid dissociation: [H+] = √(Ka × [HCN]). Substituting the given values, [H+] = √(4.9×10^-10 × 0.10) = √(4.9×10^-11) ≈ 7.0×10^-6. Then, pH = -log(7.0×10^-6) ≈ 5.15.

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