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    Hi, done my a-level chemistry practical a few days ago. I had to make salt crystals from NiCO3.

    I have to answer some questions about it now, could anyone help?

    1. From the experiment, how can you tell that Nickel sulfate is insoluble in water?
    2. When boiling off the water after all the Nickel Carbonate has dissolved in the acid, why do you not boil off ALL the water? Why do you leave some behind?

    Thanks..
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    (Original post by gian93)
    Hi, done my a-level chemistry practical a few days ago. I had to make salt crystals from NiCO3.

    I have to answer some questions about it now, could anyone help?

    1. From the experiment, how can you tell that Nickel sulfate is insoluble in water?
    2. When boiling off the water after all the Nickel Carbonate has dissolved in the acid, why do you not boil off ALL the water? Why do you leave some behind?

    Thanks..
    1. It isn't insoluble...

    2. Prevents decomposition of the recrystallising nickel sulphate and it allow you to filter off the crystals running any soluble impurities through the paper.
 
 
 
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