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8 June, 07:12

An 7.50 mL aliquot of a 125 ppm stock Red 40 dye solution was diluted to a final volume of 25.0 mL with deionized water. What is the concentration of the dilute Red 40 dye solution (in ppm) ?

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  1. 8 June, 07:17
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    The concentration is equal to 37.5 ppm

    Explanation:

    This exercise is about dilutions. We have the following dа ta:

    V1 = aliquot volume = 7.5 mL

    C1 = aliquot concentration = 125 ppm

    V2 = final volume = 25 mL

    C2 = final concentration of Red 40 dye = unknown

    the formula is as follows:

    V1xC1 = V2xC2

    Clearing C2:

    C2 = V1xC1/V2 = (7.5 mL x 125 ppm) / 25 mL = 37.5 ppm
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