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27 October, 00:56

You need a 65% alcohol solution. On hand, you have a 450

mL of a 40% alcohol mixture. You also have 95% alcohol

mixture. How much of the 95% mixture will you need to

add to obtain the desired solution?

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Answers (1)
  1. 27 October, 03:54
    0
    375 ml of 95% is what we need to obtain the desired solution

    Explanation:

    Solution

    Now

    450 ml of 40% alcohol mixture + 95% mix of x = 65% (450 + x)

    Thus

    0.40 * 450 + 0.95 x = 0.65 (450 + x)

    180 + 0.95 x = 0.65 (450 + x)

    180 + 0.95 x = 292.5 + 0.65 x

    So,

    0.95 x - 0.65 x = 292.5 - 180

    = 0.3 x = 112.5

    x = 112.5/0.3

    x = 375 ml

    Therefore, we will need 375 ml of 95% solution
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