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EDEXCEL Creating Salts (Neutralisation) help!

I really need help....

We're doing this coursework practical in school and i really don't know what to put as answer. :/

Basically, we're doing this one.

The magnesium carbonate one + sulfuric acid.

http://www.nuffieldfoundation.org/practical-chemistry/preparing-salts-neutralisation-oxides-and-carbonates

And there are questions that we need to answer.

1. What are the observations when MgCO3 is added to the HSO4?

Is it just that bubbles are formed and the solution went from clear to cloudy?

2. Why does MgCO3 MUST be insoluble?

Is it just because MgCO3 can be filtered off easily with the solution and you would be able to identify if its already in excess wherein all the HSO4 is used up?

3. What are the appearance of the crystals?

I don't know how to explain this one.

4. What would happen if all the water is taken out from heating?

Is it just anhydrous magnesium oxide would form?

5. From the chemical equation, how many mass of MgSO4.7H2O is produced from 25cm3 1mol HSO4?

Would you just find the moles of HSO4 which is 0.025 moles and find the ration which is 1:1? Or am i wrong? Then multiply 0.025 moles to the MR how MgSO4.7H2O?

6. Last question, uhm, what may be the reason why a student got a yield of over 100%??

Is it because the magnesium carbonate used in the experiment is impure? Or are there any other reason?

Thank you very much for the help guys. I would do really appreciate it :smile: