# What's the formula for potassium sulfate?

Jun 5, 2018

${\text{K"_2"SO}}_{4}$

#### Explanation:

Potassium: ${\text{K}}^{+}$

Sulfate: ${\text{SO}}_{4}^{2 -}$

We can't just combine them as it is, since potassium and sulfate have different charges. We need to equalize charges by criss-crossing the charges, like this example:

Following this image, we know that since potassium has just 1 positive charge , then there is just 1 molecule of sulfate.

Also, sulfate has a negative 2 charge, so there will be 2 atoms of potassium.

This can be written out as:
${\text{K"_2"SO}}_{4}$

Hope this helps!