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My prac method has an extra step that i dont see the point of (barium chloride was used to precipitate sulphate ions instead of barium carbonate). The step is just before precipitate is weighed: Collect the last drops of filtrate in a 100 mL beaker and test for the presence of chloride ions by...

Fantastic! :D But how does the HCl increase the crystal size of the precipitate? Why is the solution heated, and why is heat important for the precipitate to coagulate? I have another step in my prac method: Collect the last drops of filtrate in a 100 mL beaker and test for the presence of...