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The solubility of potassium chloride in water at 75 degrees Celsius is 43.1 g/100 g of water, while at 10 degrees Celsius it is 34.1 g/100 g of water. Therefore, when the solution is cooled to 10 degrees Celsius, 43.1 g - 34.1 g = 9 g of potassium chloride will crystallize out of solution.