Question

a chemistry experiment calls for 30% solution of cppper sulfate .alia has 40 ml of 25% solution how many ml of 60 % solution should she aded to obtain the needed 30% solution

Answer 1

Answer:

Hal is doing a chemistry experiment that calls for a 30% solution of copper sulfate. Hal has 40mL of a 25% solution. How many milliliters of a 60% solution should Hal add to obtain the required 30% solution?

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let x=amt of 60% solution to be added

25%*40+60%x=30%(40+x)

.25*40+.6x=12+.3x

10+.6x=12+.3x

.3x=2

3x=20

x=20/3

amt of 60% solution to be added=20/3 ml