Berapakah ph larutan KCN 0,01M jika diketahui Ka HCN = 6 x 10^-10

HCN ←→ H^+ . + CN-

[H+] = √ka . [HCN]
[H+] = √6 x 10^-10 x 1 x 10^-2
[H+] = √6 x 10^-12
[H+] = √6 x 10^-6

pH = - log [H+]
pH = 6 - log√6

pH = 6 - 0,38
pH = 5,62