SOLUTION: What quantity of pure acid must be added to 300 mL of a 40% acid solution to produce a 70% acid solution? 1 mL

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Question 627927: What quantity of pure acid must be added to 300 mL of a 40% acid solution to produce a 70% acid solution?
1 mL

Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

What quantity of pure acidhighlight%28x%29 must be added to 300 mL of a 40% acid solution to produce a 70% acid solution?

  acid + acid = acid

   x + .40*300ml = .70(300ml + x)    || Solve for x (multiply thru by 100 1st if You like)