As with any equilibrium, solubility equilibria can be manipulated or shifted wit

Question

As with any equilibrium, solubility equilibria can be manipulated or shifted with temperature. This is why solubility of a compound changes with temperature: usually heating up a solution means more solute can be dissolved because the Ksp value changes. You can see this trend in the solubility curve of sugar below. When this solution cools down, there is more solute than what Ksp should allow, a condition known as supersaturation. This process is how rock candy is made; a supersaturated solution of sugar water is created by heating the water and then a stick is placed in the solution as it cools to allow the sugar to crystallize around that as the solubility decreases. Solubility of Sugar in Water 450 400 350 300 8 200 5 150 100 10 20 30 40 50 60 70 80 90 100 Temperature C)

Explanation / Answer

from the graph, solubility of sucrose at 90oC is 400g in 100 mL of water

molar mass of sucrose = 342.3 g/mol

moles of sucrose ,n = given mass / molar mass

= 400 / 342.3

= 1..168 mol

solubility of sucrose = moles of sucrose X 1000

volume of solution

= 1.168 X 1000

100

= 11.68 moles/L

solubility reaction of sucrose:

sucrose(s) sucrose(aq)

Ksp = [sucrose(aq)]

Ksp = 11.68 mol/L

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