# Is sodium chloride a mixture?

##### 1 Answer
Aug 4, 2017

Sodium chloride solid is not a mixture. It is a pure substance... It cannot be physically separated into its components, ${\text{Na}}^{+}$ and ${\text{Cl}}^{-}$. It would require energy input, and that is clearly not a physical means.

However, if for some reason, you meant $\text{NaCl} \left(a q\right)$... then sodium chloride IN WATER is a mixture, occurring through the physical dispersion of a liquid solvent amongst the ions, ${\text{Na}}^{+}$ and ${\text{Cl}}^{-}$, that dissociate in solution, surrounding them to separate them from each other.

As a further note, the ions were held together by electrostatic attractions in a lattice, so no chemical change actually occurred!

And in water, this gives:

(This qualifies as a mixture, since evaporation allows reformation of sodium chloride solid again, thus separating the components, $\text{NaCl}$ and $\text{H"_2"O}$, via physical means. It is known as a homogeneous mixture.)