After cosumption of all HCN, its a hydrlysis of CN- ion which impose pH. The reverse rection of above reaction is the hydrolysis of CN-.
CN + H2O <---> HO- + HCN.
Also when there is excess HO- which left after complete consumption of HCN, its an excess HO- which impose pH.
pH of the solution is given as, pH = -log[H+]
For basic solutions i.e. solution with excess HO- ions first pOH is calculated and then pH + pOH = 14 formula is used.
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