The separated crystals are then dried in a second stage to remove the remaining free water (but not the water of hydration). If the final dry Na2S2O2.5h20 crystals must not contain more than 0.18wt% impurity, calculate: The amount of water added before cooling and the percentage recovery of the dried crystals.

A water solution contains 62% Na2S22 together with 1.4% soluble impurity. The solution is first diluted with water and then cooled to 10 degrees Celsius where Na2S2O2.5h20 crystallises out. The solubility of this hydrate at 10 degrees is 1.4 lb Na2S2O2.5H20 / lb free water. The crystals are then separated in the first stage filter and carry an adhering solution in the proportion: 0.058 lb solution / lb crystals. The separated crystals are then dried in a second stage to remove the remaining free water (but not the water of hydration). If the final dry Na2S2O2.5h20 crystals must not contain more than 0.18wt% impurity, calculate: The amount of water added before cooling and the percentage recovery of the dried crystals.

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