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Massa Ca(OH)2 =14,8 gram
Volume Ca(OH)2 = 100 ml
(Ar Ca=40, O=16, H=1)
Ditanya: Ph?
Dijawab :
[Ca(OH)2] =(masa:Mr) x (1000:v)
[Ca(OH)2] =14,8:(40+16+1) x (1000:100)
[Ca(OH)2] = (14,8:74) x (10)
[Ca(OH)2] = 2 M
Ca(OH)2 -----> Ca²+ + 2OH-
valesi(a)= 2
H+= a.[Ca(OH)2]
H+=2 x 2M
H+= 4M
POH= -LOG H+
POH= 1-LOG 2
PH= 14-POH
PH= 14-(1-LOG 2)
PH= 13+LOG 2
PH=13,3