Question

What is `"concentration"`? How does concentration change when volume changes?

Answer 1

We know that `"Concentration"="moles of stuff"/"volume of solution"`,

and thus `C"(concentration)"xxV"(volume)"="moles of stuff."`

Explanation:

Since `n_"moles of stuff"` is presumed to be constant; i.e. we reasonably assume that you have not added any more solute to the solution, then:

`C_1V_1=C_2V_2`, each side of the equation has units `molxxL^-1xxL=mol`, so this is consistent dimensionally. Is this what you want? Someone here will be happy to expand if I have missed the point of your question.

See [here for a pertinent example.](https://socratic.org/questions/to-what-volume-must-440-0-ml-of-3-50-m-kno-3-be-diluted-to-produce-1-50-m-kno-3)