Answer :
[tex] \frac{10 mL}{1000 mL} = 0.01 L[/tex]
[tex] \frac{40mL}{1000mL} =0.04L[/tex]
[tex]M _{1} V_{1}=M_{2}V_{2}[/tex]
[tex]M_{1}(0.01)=(0.50)(0.04)[/tex]
[tex]M_{1}(0.01)=0.02[/tex]
[tex]M_{1}= \frac{0.02}{0.01} [/tex]
[tex]M_{1}=2[/tex]
[tex] \frac{40mL}{1000mL} =0.04L[/tex]
[tex]M _{1} V_{1}=M_{2}V_{2}[/tex]
[tex]M_{1}(0.01)=(0.50)(0.04)[/tex]
[tex]M_{1}(0.01)=0.02[/tex]
[tex]M_{1}= \frac{0.02}{0.01} [/tex]
[tex]M_{1}=2[/tex]