# What is a double replacement reaction?

A double replacement reaction occurs between two ionic compounds and produces two new ionic compounds as products.

An example is:
#FeCl_3(aq) + NaOH(aq) -> Fe(OH)_3(s) + NaCl(aq)

Positive ions: $F {e}^{3 +} \mathmr{and} N {a}^{+}$
Negative ions: $C {l}^{-} \mathmr{and} O {H}^{-}$

Note that positive ions must pair with negative ions in compounds!

Here is a video which discusses this reaction in more detail.

Video from: Noel Pauller

Hope this helps!