# Reactions Between Ions in Solutions

Precipitation Reactions - Explained

Tip: This isn't the place to ask a question because the teacher can't reply.

## Key Questions

• When ions are in solution, they have been pulled apart by the dissolving properties of water.

When salt (NaCl) dissolves in water, ions of sodium and chloride pull away from each other.

NaCl(s) -> NaCl(aq)

OR

NaCl(s) -> $N {a}^{+}$(aq) + $C {l}^{-}$(aq)

A good video on this topic can be viewed here:

One reason this concept is important is that many reactions take place between dissolved ions, for example the double replacement reactions which produce precipitates.

Why would you NOT want to know the mass, the quantity, of a given solute, in a given volume of solvent?

#### Explanation:

And solubilities are quantities that are determined by experiment.

For the quantitative treatment of solubilities, see this old answer for details of ${K}_{s p}$...

I think you yourself could advance many scenarios where the knowledge of solubility is important.

• This key question hasn't been answered yet.

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