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Question

How many grams of a 25% by mass solution of KOH should be added to 400 ml of water to prepare a 15% by mass solution?

A
200 g
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B
400 g
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C
800 g
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D
600 g
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Solution

The correct option is D 600 g
Let x g of 25% KOH be added to 400 ml H2O, then
x×0.25x+400=0.15x=0.15×4000.1=600 g

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