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How many ml of a 20 percent solution should be added to 50 ml of a 40 percent solution to obtain a 25 percent solution?
Updated: 12/22/2022
150 ml
Let x be the volume of 20% solution to add. The amount of "stuff" dissolved in the 20% solution plus the amount in the 40% will equal the amount of "stuff" dissolved in the 25% solution.
(0.20)(X) + (0.40)(50 ml) = (0.25)(X+50ml)
0.2X + 20 = 0.25X + 12.5
20 - 12.5 = 0.25X - 0.20X
7.5 = 0.05X
X = 7.5/0.05 = 150 ml
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