Chemistry · May / June 2023 · Paper 61 · Question 4
0620
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Solid cobalt(II) oxide is a base which is insoluble in water. It reacts very slowly with cold dilute sulfuric acid to form a solution of cobalt(II) sulfate. Describe how to make pure, dry crystals of hydrated cobalt(II) sulfate. You are provided with cobalt(II) oxide, dilute sulfuric acid and common laboratory apparatus. [6]
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MP1 adds cobalt(II) oxide to (dilute) sulfuric acid in a suitable container
MP2 cobalt(II) oxide is in excess
MP3 the mixture is stirred / mixed
MP4 the acid / mixture is heated/warmed
MP5 filter (to remove (excess) cobalt(II) oxide)
MP6 heat filtrate / solution / leave to evaporate (reject heat to dryness)
MP7 filter out crystals / description of drying crystals
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