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    • Thread Starter

    Okay, the CHEMISTRY exam is in 2days as you might know, and I am confused about something...

    Questions that ask for reagents or chemicals to break or catalyse reactions.

    HOW do I distinguish between when I should use

    HCL or H2SO4?

    & then, how the **** do I know which concentration to use??? Dilute. moderately concentrated or concentrated???

    This is completely puzzling me...

    Any help will be highly appreciated. Cheers!
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Updated: January 26, 2010

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