Sebanyak 100 mL larutan CH3COOH 0,2 M dicampur dengan 100 mL larutan NaOH 0,2 M. jika Ka CH3COOH = 1 x 10⁻⁵ , maka pH larutan setelah dicampur adalah... a. 2 b.
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Pertanyaan
Sebanyak 100 mL larutan CH3COOH 0,2 M dicampur dengan 100 mL larutan NaOH 0,2 M. jika Ka CH3COOH = 1 x 10⁻⁵ , maka pH larutan setelah dicampur adalah...
a. 2
b. 4
c. 5
d. 6
e. 9
a. 2
b. 4
c. 5
d. 6
e. 9
1 Jawaban
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1. Jawaban Robinn
CH3COOH + NaOH → CH3COONa + H2O
→ CH3COOH
m = 0,2 x 100 = 20
r = 20
s = -
→ NaOH
m = 0,2 x 100 = 20
r = 20
s = -
→ CH3COONa
m = -
r = 20
s = 20
M = n / v
M = 20/100 + 100
M = 20 / 200
M = 1/10
M = 0,1M
→ H2O
m = -
r = 20
s = 20
[OH-] = √kw/ka . [anion]garam
[OH-] = √10^-14/10^-5 . 1 x10^-1
[OH-] = √10^-9 . 10^-1
[OH-] = √10^-10
[OH-] = 10^-5
pOH = -log [OH-]
pOH = -log 10^-5
pOH = 5
pH = 14 - 5
pH = 9