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Solution: The Ka of HCN is 6.2 x 10 -10. What is the Kb value for CN - at 25°C

Problem

The Ka of HCN is 6.2 x 10 -10. What is the Kb value for CN - at 25°C

Solution

Since CN-  is the conjugate base of the weak acid HCN, we can relate Ka and Kb by the equation below:

Take note that the Kw at room temperature is something that you must memorize.

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