CH-38
Preparing salts
Chemistry · Secondary 3 · Hard · Preparing salts
A student wants to prepare pure dry crystals of copper(II) sulfate by reacting excess copper(II) oxide with dilute sulfuric acid. Which final step should be carried out after filtering off the unreacted solid?
A) Heat the filtrate to dryness directly.
B) Evaporate the filtrate to crystallisation point, then dry the crystals between filter papers.
C) Cool the filtrate in an ice bath without evaporation.
D) Add more copper(II) oxide until a precipitate forms, then dry it.
A) Heat the filtrate to dryness directly.
B) Evaporate the filtrate to crystallisation point, then dry the crystals between filter papers.
C) Cool the filtrate in an ice bath without evaporation.
D) Add more copper(II) oxide until a precipitate forms, then dry it.
- Heat the filtrate to dryness directly.
- Evaporate the filtrate to crystallisation point, then dry the crystals between filter papers.
- Cool the filtrate in an ice bath without evaporation.
- Add more copper(II) oxide until a precipitate forms, then dry it.
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