An aqueous solution containing 60% Na2S2O3 and 1% soluble impurities is diluted with water and fed to a crystallizer where it is cooled in order to crystallize Na2S2O3-5H2O. The crystals carry 0.05 kg of solution (excluding impurities) per kg of crystals. The free water present in the adhering solution is removed on drying the crystals. Th
An aqueous solution containing 60% Na2S2O3 and 1% soluble impurities is diluted with water and
fed to a crystallizer where it is cooled in order to crystallize Na2S2O3-5H2O. The crystals carry
0.05 kg of solution (excluding impurities) per kg of crystals. The free water present in the adhering
solution is removed on drying the crystals. The final dried product contains not more than 0.1%
impurity. The solubility of the hydrate is 1.5 kg Na2S2O3-5H2O/kg free water. On the basis of 100
kg of 60% solution, calculate the following:
a) the amount of water in kilograms before cooling
b) the amount of crystals in kilograms formed
c) the percentage recovery of Na2S2O3 in the dried hydrated crystals
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