how much water must be added to 72 mL of a 3% solution of mercurochrome in order to reduce it to a 2% solution?
The amount of mcc in each solution is the same...
.03 * 72 = .02 (72+x)
2.16 = 1.44+ .02x
.72 =.02x
x =36 ml added to 72 ml of 3% to dilute it to 2%
