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If in the graph above 1 dm 3 of a saturated solution of KCL is...

Chemistry
JAMB 1989

If in the graph above 1 dm 3 of a saturated solution of KCL is cooled from 80°C, the mass of crystals deposited will be
[K = 39, Cl = 35.5]

  • A. 7.45 g
  • B. 14.90 g
  • C. 74.50 g
  • D. 149.00 g
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Correct Answer: Option D
Explanation

Trace the graph to the y-axis to obtain the solubility of the salt at 80°C and at the point where the straight line touches the y-axis, the solubility of the salt at these respective temperatures is 4mol\dm3 and 6mol\dm3

solubility of salt that will crystallize out = 6-  4 = 2mol\dm3

therefore mass of salt deposited = solubility x molar mass of salt

2 x 74.5 = 149.00g

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