CH-1103
Preparing salts
Chemistry · Secondary 4 · Medium · Preparing salts
A student wants to prepare pure, dry crystals of zinc sulfate from zinc carbonate and dilute sulfuric acid. Which step must he carry out after adding excess zinc carbonate and filtering off the unreacted solid?
- Evaporate the filtrate until saturated, then cool to crystallise the salt.
- Heat the filtrate to dryness immediately to obtain the salt.
- Add sodium hydroxide to precipitate zinc sulfate.
- Cool the filtrate in an ice bath without evaporation.
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