ph 3,7 gram kalsium hidroksida dalam 10 liter air

3,7 gram Ca(OH)2
V = 10 L = 10000 mL
Mr Ca(OH)2 = 74

pH ... ?

*Molaritas Ca(OH)2
M = gram/Mr × 1000/mL
M = 3,7/74 × 1000/10000
M = 0,05 × 0,1
M = 0,005

*Ca(OH)2 adalah basa kuat
[OH^-] = b × Mb
[OH^-] = 2 × 0,005
[OH^-] = 0,01
[OH^-] = 10^-2

pOH = - log [OH^-]
pOH = - log 10^-2
pOH = 2

pH = 14 - pOH
pH = 14 - 2
pH = 12