# Question #9d93c

Apr 29, 2017

In 100 g of 37 % acid, you have 37 g ${\text{H"_3"PO}}_{4}$.
$\text{Mass of 85 % acid needed" = 37 color(red)(cancel(color(black)("g H"_3"PO"_4))) × "100 g 85 % acid"/(85 color(red)(cancel(color(black)("g H"_3"PO"_4)))) = "44 g 85 % acid}$