The mass of the sediment formed after boiling the water was 1.84 g. Calculate the mass of calcium
| January 5, 2021 | education
The mass of the sediment formed after boiling the water was 1.84 g. Calculate the mass of calcium and magnesium bicarbonates contained in the water.
Decision:
Са (НСОЗ) 2 = Н2O + СO2 + СаСОЗ (sediment)
Mg (HCO3) 2 = Н2O + СO2 + МgСОЗ (sediment)
It is possible through proportion, using the molar masses of both substances:
162 g / mol + 145 g / mol – X g
100 g / mol +84 g / mol – 1.84 g
Hence the total mass of both hydrocarbons:
X = (162 + 146) * 1.84 / (100 + 84) = 3.08 g
Answer: 3.08 g
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