CH-1100
Preparing salts
Chemistry · Secondary 4 · Hard · Preparing salts
A student wants to prepare pure dry crystals of sodium sulfate using dilute sulfuric acid and solid sodium carbonate.
Which sequence of steps should she carry out after adding excess sodium carbonate to the acid until effervescence stops?
Which sequence of steps should she carry out after adding excess sodium carbonate to the acid until effervescence stops?
- Filter the mixture, heat the filtrate to concentrate it, then cool to crystallise the salt.
- Evaporate the mixture to dryness, then add water to dissolve the sodium sulfate crystals.
- Filter the mixture, cool the filtrate in an ice bath immediately, then evaporate the crystals to dryness.
- Heat the mixture to boiling, then filter off the hot solution to obtain dry crystals directly.
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