# What is the formula of aluminum carbonate?

May 6, 2018

 Al_2CO_3)_3

#### Explanation:

Aluminium generally has a charge of +3
The electron configuration of Aluminium is $1 {s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{2} 3 {p}^{1}$
=
The 3p electron and the 2 3s electrons are outer valance electrons and are lost to form the +3 charge.

The Carbonate ion has a charge of -2

$1 C = 1 \times + 4$
$3 O = 3 \times - 2 = - 6$

$+ 4 + - 6 = - 2$

Chemical compounds have a net charge of zero

$2 \times \left(+ 3\right) + 3 \times \left(- 2\right) = 0$
$+ 6 + - 6 = 0$

so the formula is

$A {l}_{2} {\left(C {O}_{3}\right)}_{3}$

May 6, 2018

$A {l}_{2}$${\left(C {O}_{3}\right)}_{3}$

#### Explanation:

Aluminium - $A {l}^{3}$
Carbonate - $C {O}_{3}^{-} 2$

Because the charge of aluminium is 3 and the charge of carbonate is -2, you need to multiply each to balance out at 6. So, "swap and drop":

2$A {l}^{3}$ & 3$C {O}_{3}^{-} 2$

$A {l}_{2}$${\left(C {O}_{3}\right)}_{3}$