Question

How do we specify a concentration, given `0.02*mol` of calcium chloride dissolved in a volume of water?

Answer 1

This question is ill-proposed...........

Explanation:

I could have a `1*L` volume of `0.02*mol*L^-1` of `CaCl_2` containing `0.02*mol` `CaCl_2`;

I could have a `10*L` volume of `0.02*mol*L^-1` of `CaCl_2` containing `0.2*mol` of `CaCl_2`;

I could have a `100*L` volume of `0.02*mol*L^-1` of `CaCl_2` containing `2.0*mol` of `CaCl_2`.

Can you work out the MASS of solute in each solution?

When we specify a concentration we refer to the quotient.......

`"Moles of solute"/"Volume of solution"`, and thus `"concentration"` typically has the units `mol*L^-1`.