Chemistry · May / June 2025 · Paper 62 · Question 4
0620
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Magnesium sulfate is a salt. Magnesium sulfate is soluble in water. The solubility of a salt is the mass of the salt, in g, that dissolves in 100 cm3 of water at a specified temperature. Plan an investigation to determine the solubility of magnesium sulfate in water at 50 C. Your plan must include how the solubility of magnesium sulfate, in g per 100 cm3 of water, can be found. You are provided with solid magnesium sulfate, distilled water and common laboratory apparatus. [6]
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100 cm3 of water measured using suitable apparatus and placed into a suitable container
water is heated to 50 °C
water is maintained at this temperature
magnesium sulfate is added in excess or in portions until no more dissolves
the mixture is stirred
the solution is filtered to remove undissolved magnesium sulfate or the mass used is known
the use of appropriate measurements to calculate the solubility.
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