Question

To make a 1.0L dilute of 0.5M from a stock solution of 12M, how much solution will be needed?

Answer 1

`V_(concentrated)=0.042L=4.2mL`

Step-by-step explanation:

Hello,

In this case, since in a dilution process the moles of the solute must remain unchanged, we use the volumes and molarities as shown below:

`M_(diluted)V_(diluted)=M_(concentrated)V_(concentrated)`

Clearly, the concentrated solution is 12M and the diluted solution is 0.5 M, thus, the volume of the concentrated solution we should take is:

`V_(concentrated)=(M_(diluted)V_(diluted))/(M_(concentrated)) =(0.5M*1.0L)/(12M)\\ \\V_(concentrated)=0.042L=4.2mL`

Best regards.