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AQA Science ISA - Preliminary help!

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    I am doing my section one test tomorrow, and the only question I do not understand is the preliminary one. Our teacher refuses to help us on this, and I really do not understand.

    My hypothesis is:
    The amount of carbonate in an ore sample can be measure by adding hydrochloric acid to the sample until it stops fizzing.

    My variables are
    Dependent - Measurement (time)
    Independent - Calcium Carbonate (Amount)
    Control - Keep the method the same and HCL

    Please help with structure! I am clueless, and Chemistry is my worst subject! Ahhhhhh!



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