SOLUTION: A chemist needs a 30% acid solution. How much pure acid needs to be mixed with 5 milliliter a of a 10% acid solution to obtain the desired solution?

Question 1080562: A chemist needs a 30% acid solution. How much pure acid needs to be mixed with 5 milliliter a of a 10% acid solution to obtain the desired solution?
Found 2 solutions by Fombitz, rapture:
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Let X be the amount of pure acid,

Solve for X.

Answer by rapture(86) (Show Source): You can put this solution on YOUR website!
What you want, where x is the amount of pure acid added in mL:
0.10(5) + x = 0.50(x + 5)
Solve for x to find your answer.
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