Question

What is the molarity of the solution made by adding 5 mL of 0.1 M `HCl` to 45 mL of the water is 0.01?

Answer 1

Well, the new concentration is `0.01*mol*L^-1`, i.e. you have diluted the original concentration tenfold....

Explanation:

And we use the relationship...

`"Molarity"="Moles of solute"/"Volume of solution"`

`=(5xx10^-3*Lxx0.1*mol*L^-1)/(50xx10^-3*L)=0.01*mol*L^-1`....

How did I know that the volume was `50*mL`..