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    I am doing an experiment to find out how the concentration affects the rate of diffusion. This is my experiment:

    Take a large gelatine cube and cut into 15 equal pieces

    Place one piece of the cube into the test tube

    Measure out 10mls of HCl in the measuring cylinder

    Pour the HCl into the test tube with the gelatine cube and start
    the clock

    Time how long it takes for the pink colour inside the gelatine
    cube to completely disappear

    Record your results and repeat this same process 3 times for each
    molar of acid.

    I need to choose a control variable and describe a preliminary investigation to find a suitable value. Could anyone help me before tomorrow?
 
 
 
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