# Explain the formula

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Thread starter 6 years ago
#1
I have problems with this formula:
V1C1 = V2C2
where:
V1 = volume of starting solution needed to make the new solution
C1 = concentration of starting solution
V2 = final volume of new solution
C2 = final concentration of new solution

Why it is like that? I cannot find the explanation of this formula.
And can I use mol/L units for concentration?

Thank you in advance!
0
6 years ago
#2
If you have a certain mass of a chemical, it contains a certain number of moles of that chemical.

If you dissolve that chemical in a certain volume (V1) it will have a certain concentration (C1).

If you add (or remove) some water, the number of moles of chemical doesn't change, but the volume will (to V2), the concentration of the chemical will also change (to C2).

n = c.v is what drives it all.
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