3,7 gram Ca(oh)2 dilarutkan dalam airdan volume larutan dibuat tepat 200 ml (H=1:C=12N:14 Ca= 40)

wt = 3,7 gram
Mr = 74 gr/mol
V = 200 mL
M = ......................?

M = wt/Mr x 1000/V
= 3,7/74 x 1000/200
= 0,05 x 5
= 0,25 molar