sebanyak 50 ml larutan ch3cooh 0,1 m (ka = 10 pangkat -5) direaksikan dengan 50 ml larutan koh 0,1 m, ph campuran yang terjadi adalah... a. 3 b. 6 - log 7 c.

CH3COOH + KOH → CH3COOK + H2O

→ CH3COOH
m = 50 x 0,1 = 5
r = 5
s = -

→ KOH
m = 50 x 0,1 = 5
r = 5
s = -

→ CH3COOK
m = -
r = 5
s = 5

M = n / v
M = 5 / 50 + 50
M = 5 / 100
M = 0,05 M

→ H2O
m = -
r = 5
s = 5

[OH-] = √Kw/Kb . [anion]garam
[OH-] = √10^-14/10^-5 . 5 x 10^-2
[OH-] = √10^-9 . 5 x 10^-2
[OH-] = √10^-11 x 5
[OH-] = √10^-10 x 0,5
[OH-] = √0,5 x 10^-5

pOH = -log [OH-]
pOH = 5 - log√0,5

pH = 14 - (5 - log√0,5)
pH = 14 - 5 + log√0,5
pH = 9 + log√0,5
pH = 9 + (-0,150515)
pH = 9 - 0,150515
pH = 8,849485
pH = 8 + 0,849485
pH = 8 + log7