Question 21
Solubility and SolutionsFrom the diagram above, the mass of crystals deposited when 1 dm3 of a saturated solution of NaCl is cooled from 80°C to 60°C is [Na = 23, Cl = 35.5].
- A.117.00 g
- B.58.50 g
- C.11.70 g
- D.5.85 g
Show the answer and explanation
Answer: A (117.00 g)
Explanation
From the graph the solubility falls by about 2 mol dm−3 between 80°C and 60°C. So 2 mol of NaCl crystallizes from 1 dm3: 2 × 58.5 = 117 g.