Answer:
In an empty 100 mL of volmetric flask add 0.4 mL of 0.500 M solution of NaCl and add add water upto the mark of 100 mL .
Explanation:
Molarity of the solution before dilution = [tex]M_1=0.500 M[/tex]
Volume of the solution before dilution = [tex]V_1[/tex]
Molarity of the solution after dilution = [tex]M_2=0.00200 M[/tex]
Volume of the solution after dilution = [tex]V_2=100 mL[/tex]
[tex]M_1V_1=M_2V_2[/tex]
[tex]V_1=\frac{M_2V_2}{M_1}=\frac{0.00200 M\times 100 mL}{0.500 M}[/tex]
[tex]V_1=0.4 mL[/tex]
In an empty 100 mL of volmetric flask add 0.4 mL of 0.500 M solution of NaCl and add add water upto the mark of 100 mL .
