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JAMB Chemistry 1983 Question 37

Question 37

Solubility and Solutions

3.06 g of a sample of potassium trioxochlorate (V) (KClO3) was required to make a saturated solution with 10cm3 of water at 25°C. The solubility of the salt at 25°C is [K = 39, Cl = 35.5, O = 16]

  1. A.5.0 moles dm−3
  2. B.3.0 moles dm−3
  3. C.2.5 moles dm−3
  4. D.1.0 moles dm−3
  5. E.0.5 moles dm−3.
Show the answer and explanation

Answer: C (2.5 moles dm−3)

Explanation

3.06 g in 10 cm3 = 306 g per dm3; 306 ÷ 122.5 = 2.5 mol dm−3.