Potassium sulfate has a solubility of 15g/100g water at 40 celsius. a solution is prepared by adding 39.0g of potassium sulfate to 225g water, carefully heating the solution, and cooling it to 40 celsius. a homogeneous solution is obtained. is this solution saturated, unsaturated, or supersaturated? the beaker is shaken and precipitation occurs. how many grams of potassium sulfate would you except to crystallize out?

Explanation:

Solubility of potassium sulfate at 40 °C = 15 g/100 g

This means that at 40 °C 15 g of potassium sulfate will get completely dissolved in 100 of water.

39.0 g of potassium sulfate to 225 g water, carefully heating the solution.

Amount of potassium sulfate will get dissolve in 225 g of water at 40 °C will be:

Amount of potassium sulfate precipitated out by the solution:

= 39.0 g-33.75 g = 5.25 g

At 40 °C 5.25 g of potassium sulfate will get precipitate out from the solution which means that solution is saturated.

Saturated solution are solution in which solute is dissolved in maximum amount. Further addition of solute results in precipitation of solute form the solution.

5.25 grams of potassium sulfate will get crystallize out.

the answer to your question is c.

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