Posted by **Jon** on Friday, December 11, 2009 at 10:05pm.

These review questions are stumping me.

How much water must be added to 50 ML of a 35% acid solution to produce a mixture that is 20% acid.

Could it be as simple as 15% water?

- Math -
**bobpursley**, Friday, December 11, 2009 at 10:13pm
how much acid initially?

.35*50ml= 17.5ml

How much water?

.65*60=32.5ml

.20(32.5+X)=17.5

solve for X

- Math One more thing -
**Jon**, Friday, December 11, 2009 at 10:22pm
I got the answer to be 55 ml, but can you please explain how you knew to do that?

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