Calculate the pH of a 0.021 M NaCN solution.[Ka(HCN)= 4.9 × 10^-¹⁰]

Name: Calculate the pH of a 0.021 M NaCN solution.[Ka(HCN)= 4.9 × 10 - 10 ]
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Quizplus · Accepted Answer

NaCN is a salt of a weak acid (HCN) and a strong base (NaOH). The CN⁻ ion will hydrolyze in water to form OH⁻, making the solution basic. The Kb for CN⁻ can be calculated using Kw/Ka(HCN). The pH is then calculated using the concentration of OH⁻ formed. The correct pH is 10.81.

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