Question

If a chemist wants to make 575 milliliters of 0.75 M HCl solution from a stock solution of 2.0 M HCl, how many milliliters of the stock solution would the chemist need to use

Answer 1

The answer is 216 mL

Answer 2

Answer : The volume of stock solution will be, 215 ml

Solution :

According to the neutralization law,

`M_1V_1=M_2V_2`

where,

`M_1` = molarity of HCl solution = 0.75 M

`V_1` = volume of HCl solution = 575 ml

`M_2` = molarity of stock solution = 2.0 M

`V_2` = volume of stock solution = ?

Now put all the given values in the above law, we get the volume of stock solution.

`(0.75M)* (575ml)=(2.0M)* V_2`

`V_2=215ml`

Therefore, the volume of stock solution will be, 215 ml