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25 January, 17:33

A laboratory technician needs to make a 108 -liter batch of a 20 % acid solution. how can the laboratory technician combine a batch of an acid solution that is pure acid with another that is 10 % to get the desired concentration?

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  1. 25 January, 17:44
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    The answer to this question would be:

    100% solution = 12 liter

    10% solution = 96 liter

    In this question, you have 2 kinds of a solution with different concentration and try to make the third solution. To answer this question, you need to understand that you need to match the amount of the molecule. You can get the amount of molecule by multiplying the concentration with the volume.

    The calculation would be:

    volume1+volume2 = volume3

    volume1 + volume2 = 108l

    volume1 = 108l - volume2

    amount1 + amount 2 = amount3

    volume1 * concentration1 + volume2 * concentration2 = volume3 * concentration3

    volume1 * 100% + volume2 * 10% = 108 liter * 20%

    volume1 + 1/10 volume2 = 21.6 liter

    (108liter - volume2) + 1/10 volume2 = 21.6liter

    108liter - 9/10 volume2 - 21.6liter

    108liter - 21.6 liter = 9/10 volume2

    9/10 volume2 = 86,4 liter

    volume2 = 96liter

    volume1 = 108liter - volume2

    volume1 = 108 liter - 96 liter = 12 liter
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