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How many milliliters of a 5.0 M H2SO4 stock solution would you need to prepare 132.0 mL of 0.21 M H2SO4?

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    How many mols do you need? That is M H2SO4 x L H2SO4 = ?
    Then mL x M = moles Substitute the dilute numbers and solve for the unknown.
    You can use the dilution formula, also, if that is easier for you.
    c1v1 = c2v2
    c = concn
    v = volume

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