36. A student mixes 10.0 g of KCIOs with 45.0 of H20 and stirs it for a long tim

Question

36. A student mixes 10.0 g of KCIOs with 45.0 of H20 and stirs it for a long time at 60°C until the solution is completely clear then allows it to cool slowly to 20°C where it remains clear. Which statement about the final clear mixture at 20°C is correct? 3..'..: ,..:..; 20 10 10 20 30 40 50 60 70 80 90 Temperature, A. It is a saturated solution. B. It is an unsaturated solution and carn be made saturated by decreasing the temperature. C. It is an unsaturated solution and can be made saturated by increasing the temperature D. It is a supersaturated solution.

Explanation / Answer

The solubility of KClO3 at 60oC = 26g/100g water

Let us calculate how much KClO3 dissolves in 45g water at 60oC

amount of KClO3 that can dissolve= 45*26/100 = 11.7g

But we dissolve only 10g so the solution is still unsaturated.

The solubility of KClO3 at 20oC = 10g/100g water

Let us calculate how much KClO3 dissolves in 45g water at 20oC

amount of KClO3 that can dissolve= 45*10/100 = 4.5g

But we have 10 grams in that solution but still the solution is clear. Hence it is a supersaturated solution.

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