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16 April, 11:35

If 100.0 ml of HCI stock solution is used to make 500.0-ml of a 0.675 M HCI dilution, what is the molarity of the stock solution?

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  1. 16 April, 15:08
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    3.375 M.

    Explanation:

    It is known that the no. of millimoles of HCl before dilution = the no. of millimoles of HCl after dilution.

    ∵ (MV) before dilution = (MV) after dilution.

    ∴ M before dilution = (MV) after dilution / V before dilution = (0.675 M) (500.0 mL) / (100.0 mL) = 3.375 M.
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