Unit 12 · Experimental Techniques and Chemical Analysis
Question Bank
Cambridge IGCSE Chemistry 0620 · 59 questions
Q50Experimental Techniques and Chemical Analysis
How are crystals of hydrated copper(II) sulfate obtained from its solution?
(a)Evaporate all the water rapidly to dryness
(b)Heat to the saturation point, cool, then filter off the crystals
(c)Filter the solution through filter paper
(d)Add more water and leave it to stand
Correct answer: (b) Heat to the saturation point, cool, then filter off the crystals
Explanation: Crystallisation: concentrate the solution, let it cool so crystals form, then filter and dry them. Heating to dryness would remove the water of crystallisation.
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