please siapa aja yg bisa bantu soal kimia ini...besok dikumpul :'(

No 9
N = m/Mr
= 0,074 gr / 74
= 0,001 mol
M = N/V
= 0,001 / 0,1 (Dari 100ml ke Liter)
= 0,01 -> 10^-2 M

Ca(OH)2 -> koef = 2
[OH-] = 2 × 10^-2
pOH = - log 2 × 10^-2
= 2 - log 2

pH = 14 - pOH
= 14 - ( 2 - log 2 )
= 12 + log 2 (C)