How much pure acid must be added to a 30% acid solution to make a 60L solution which is 50% acid?

Answer 1

Did that one last night

http://www.jiskha.com/display.cgi?id=1391650592

Answer 2

Oh okay. Will look at the link. Thanks.

Answer 3

Hi Reiny, I already saw the link. But how did you get the 10x on the second part? Did you multiply everything by 10? Why so? Why not 100?