Question

If 75% solution of HCl of 100ml wants to be diluted.Calculate How much volume in cm3 of solvent is required to dilute the solution upto 40%

Answer 1

could you please mention if it is volume percent or mass percent.

lets assume it to be volume percentage.
so there is 75ml of HCL

now according to the question

75/( 100 + x ) *100 = 40
100+x = 75 *2.5
x = 187.5 -100
x = 87.5 ml = 87.5 cm³