Question

What is a double replacement reaction?

Answer 1

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: `Fe^(3+) and Na^+`
Negative ions: `Cl^- and OH^-`

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!