S. Interpreting Solubility Curves 150 140 A. How many grams of ammonium chloride

Question

S. Interpreting Solubility Curves 150 140 A. How many grams of ammonium chloride (NH.CI) can be dissolved in 200 grams of water at 90°c? Show calculation. 130 dg 100 90 e 80 70 60 ST At 50°C, 80 g of KNO, is dissolved in 100 g of water. Is this solution unsaturated, saturated, or supersaturated? Explain B. aci 30 10 Ce2(S04)3 0 10 20 30 40 50 60 70 80 90 100 Temperature () C. A saturated solution of KCI is cooled from 80°C to 10°C. How many grams of KCI precipitate out of solution? Show calculations

Explanation / Answer

A.At 90oC the solubility of NH4Cl from the graph is 70g per 100 g of watrw.

So for 200 g of water it's solubility is 70g*(200g/100g)= 140g

B) From the graph the solubility of KNO3 at 50oC is 80 g per 100 g of water.so the given solution is saturated solution.

C) The solubility of KCl at 80oC is 50 g

The solubility of KCl at 10 oC is 30 g

So upon cooling from 80 to 10 oC the precipitate formed is 50-30=20 g

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