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Na2CO3 = 14,5% x 100 = 14,5 gr
H2O = 100 - 14,5
= 85,5 gr
mol H2O = massa ÷ Mr
= 85,5 ÷ 18
= 4,75 setara dengan 5
mol Na2CO3 = massa ÷Mr
= 14,5 ÷ 106
= 0,13 setara dengan 0
maka rumus hidratnya adalah Na2CO3.5H2O