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18 March, 07:19

A student is asked to prepare 400.0 mL of a 0.25M HCl solution. The students find a bottle labeled ""2.0M HCl."" How many mL of the 2.0M solution are needed to prepare the 0.25M solution?

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  1. 18 March, 07:36
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    The answer to your question is He needs 50 ml of 2.0 M HCl.

    Explanation:

    Data

    Volume 2 = 400 ml

    [HCl] 2 = 0.25 M

    [HCl] 1 = 2.0 M

    Volume 1 = ?

    To solve this problem use the dilution formula

    Formula

    V₁C₁ = V₂C₂

    Solve for V₁

    V₁ = V₂C₂ / C₁

    Substitution

    V₁ = (400) (0.25) / 2

    Simplification

    V₁ = 100 / 2

    Result

    V₁ = 50 ml
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