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17 September, 11:52

1 L of a 78% acid solution was mixed with 6 L of a 64% acid solution. Find the concentration of the new mixture.

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  1. 17 September, 14:39
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    The first solution contributes 0.78*1 = 0.78 L of acid.

    The second contributes 0.64*6 = 3.84 L of acid.

    There will be 7 L total of the new solution, and 3.84 + 0.78 = 4.62 total L of acid in it. So the new solution has a concentration of 4.62/7 = 0.66, or about 66%.
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