Well is this GCSE????
this may not be correct lol:
I think you need to talk about how you stir the carbonate ting with HCL in a beaker till it's in excess, then place it a water bath and gently heat with a Bunsen burner till you can see small crystals form. Then you filter it and pat dry and leave it to air-dry. Bigger crystals of whatever the thin......
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