SOLUTION: You have 100 mL of 10% acid,how many mL of 100% acid do you need to add to make the solution 20%? i don't know where to start.

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Question 474871: You have 100 mL of 10% acid,how many mL of 100% acid do you need to add to make the solution 20%?
i don't know where to start.
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
You have 100 mL of 10% acid,how many mL of 100% acid do you need to add to make the solution 20%?
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let x=ml of 100% acid to add
10%(100)+100%x=20%(100+x)
10+x=20+.2x
.8x=10
x=10/.8=12.5
ans:
amt of 100% acid to add=12.5 ml