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    Hi, I'll be doing WJEC BY3 practical resits next week. There are a couple of things that I don't quite get. I'm doing enzyme based prac by the way.

    For example, for the independent variable. We have to do a range of 5 or more concentrations of hydrogen peroxide for example. The stock solution says 20 vol of hydrogen peroxide so that equivalents to 100%. So the possible ranges of concentration are: 0% 20% 40% 60% 80% 100%

    0% - 10 cm3 of water
    20% - 2 cm3 of hydrogen peroxide + 8cm3 of water
    And so on....

    But what if the stock solution says 2% hydrogen peroxide. How do we do the range of concentration?

    Thanks in advance...
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