Question

A `16.7*g` mass of sodium sulfate is dissolved in a volume of `0.125*L` of water. What is the concentration with respect to sodium sulfate?

Answer 1

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

Explanation:

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

`=` `(16.7*g)/(142.04*g*mol^-1)xx1/(0.125*L)` `=` `0.940*mol*L^-1` with respect to sodium sulfate.

Note that the way we have set out the problem, appropriate units are obtained automatically. What is the concentration with respect to sulfate ion; with respect to sodium ion?