A student is provided with a solid mixture containing three substances:
The student wants to obtain a pure, dry sample of cobalt(II) carbonate (CoCO3\text{CoCO}_3CoCO3) from this mixture. Which of the following experimental procedures should the student use?
Add cold water to the mixture, filter, wash the residue with cold water, and dry.
Add hot water to the mixture, filter while hot, wash the residue with hot water, and dry.
Add hot water to the mixture, filter while hot, cool the filtrate to crystallise, and filter to collect the crystals.
Add hot water to the mixture, cool the mixture to room temperature, filter, wash the residue with cold water, and dry.
