Question

Sebanyak 50 mL larutan NaOH 0,1 M dicampurkan dengan 50 mL larutan CH3COOH 0,1 M. Tentukan pH campuran! (Ka CH3COOH = 1,8 × 10–5)

Answer 1

N NaOH = 50 . 0,1 = 5
n CH3COOH = 50 . 0,1 = 5

NaOH + CH3COOH --> CH3COONa + H2O

nCH3COONa = 1/1 x mol NaOH = 1/1 x 5 = 5
[CH3COONa] = n/v = 5/100 = 0,05

[OH-] = akar Kw/Ka . [g]
= akar 10^-14/1,8 x 10^-5 . 5x10^-2
= akar 5 x10^-16/1,8 x10^-5
= akar 2,78 x 10^-11
=

Lanjutkan jadi pOH dan pH nya ya, gak punya kalkulator :D