Tentukan ph dari larutan 100ml NACN 0,2M dik ka=1*10-5

[OH-] = akar (Kw/Ka × Mgaram × valensi)
[OH-] = akar (10^-14/10^-5 ×2 × 10^-1 × 1)
[OH-] = akar (2 × 10^-10)
[OH-] = 1.4 × log 10^-5
pOH = 5 - log 1.4
pH = 9 + log 1.4