🤓 Based on our data, we think this question is relevant for Professor Golde's class at PITT.
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.
The Ka of HCN is 6.2 x 10 -10. What is the Kb value for CN - at 25°C