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26 January, 10:29

A solution is made by diluting a standard solution by adding 25 mL of the standard solution to 75 mL of distilled water. What is the concentration of the resulting solution?

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  1. 26 January, 13:24
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    The concentration of the resulting solution is 0.25 or one quarter of the standard solution

    Explanation:

    Whereby the molar concentration of the standard solution is P molar per liter, we have

    25 ml of the standard solution contains

    25/1000*P moles of the standard solution such that the resultant solution has a volume of 25 + 75 = 100 ml contains 0.025 P moles of the standard solution

    The concentration of a solution is the number of moles contained per liter, which gives

    100 ml contains 0.025 P moles

    1 liter = 1000 ml will contain 1000/100 * 0.025 = 0.25 P moles of the stanard solution

    Therefore, the concentration of the resulting solution is 0.25 or one quarter of the standard solution.
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