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9 September, 03:16

To 25mL of 0.90M HCl, 275mL do distilled water is added. What is the molarity of the resulting solution?

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  1. 9 September, 03:50
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    0.075 M.

    Explanation:

    It is a dilution process. We have the rule states that the no. of millimoles before dilution is equal to the no. of millimoles after dilution.

    (MV) before dilution = (MV) after dilution

    M before dilution = 0.90 M.

    V before dilution = 25.0 mL.

    M after dilution = ? M.

    V after dilution = V of HCl + V of water added = 25.0 mL + 275.0 mL = 300.0 mL.

    ∴ M after dilution = (MV) before dilution / V after dilution = (0.90 M) (25.0 mL) / (300.0 mL) = 0.075 M.
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