Ka Weak Acid HCN ? H+ + CN- Ka = [H+][CN-] / [HCN] = 6.2 !! 10^-10 What is the pH of a 0.5 M HCN solution? Kb Weak base NH3 + H2O ? NH4+ + OH- Kb = [NH4+][OH-] / [NH3] = 1.8 !! 10^-5 What is the pH of a 0.5 M NH2OH solution?
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For the HCN solution, we are given the Ka value and the initial concentration of HCN. We can use the Ka expression to find the concentration of H+ ions and then calculate the pH. Ka = [H+][CN-]/[HCN] 6.2 x 10^{-10} = [H+][H+]/(0.5 - [H+]) Let x = [H+], Show more…
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