How can I calculate the moles of ions in solutions?

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Answer 1 · 2014-12-17T16:12:20

Concentration is usually expressed as moles per cubic decimetre or moles per litre.

$c=n/v$

So $n=cv$

So to find the number of moles we multiply concentration by volume.

E.g how many moles of NaCl in $25cm^3$ of a solution of concentration $2.0mol.dm^(-3)$ ?

$n=cv=(25)/(1000)xx2=0.05mol$

Note I divide by 1000 to convert $cm^3$ to $dm^3$ .