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18 March, 21:49

How many ml of 50 percent acid should be added to pure acid to make 70ml of 65 percent acid?

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  1. 18 March, 23:28
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    91 mL

    Explanation:

    In chemistry, to solve this kind of exercises, dilutions, and concentrations is common to use the following equation

    C1*V1=C2*V2

    In which V1 refers to volume 1, in this case, is 70mL because is the quantity I have, the solution I can use to obtain another solution. C1 refers to the concentration of the solution I also have, in this case, 65%.

    C2 and V2 refer to the volume and concentration of the solution I am looking for. So, if want to know V2, which is the volume I need to add, the only thing to do is find V2 in the equation:

    V2=C1*V1/C2

    V2 = 65%*70mL/50%

    V2 = 91mL
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