Question

Tentukan pH larutan basa :
a. 4 gram NaOH dilarutkan dalam air hingga 10 L
b. 50 mL larutan Ba(OH)2 0,1 M

Answer 1

Mapel: Kimia
Kelas: XI (SMA)
Kategori: Asam Basa


Pembahasan:
a. M = gr/mr × 1/V
M = 4/40 × 1/10
M = 10^-2

[OH^-] = b × Mb
[OH^-] = 1 × 10^-2
pOH = 2
pH = 14 -2 = 12

b. [OH^-] = b× Mb
[OH^-] = 2 × 10^-1
pOH = 1 - log 2
pH = 14-(1-log2)
pH= 13 + log 2