Answer :
Answer: Thus 167 ml of a 0.75M solution is needed to make 500 mL of a 0.25M solution
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.
According to the dilution law,
[tex]M_1V_1=M_2V_2[/tex]
where,
[tex]M_1[/tex] = molarity of concentrated solution = 0.75 M
[tex]V_1[/tex] = volume of concentrated solution = ?
[tex]C_2[/tex] = concentration of dilute solution= 0.25 M
[tex]V_2[/tex] = volume of dilute solution= 500 ml
Putting in the values we get:
[tex]0.75\times V_1=0.25\times 500[/tex]
[tex]V_1=167ml[/tex]
Thus 167 ml of a 0.75M solution is needed to make 500 mL of a 0.25M solution