# How many different elements are found in H_2SO_4 + 2KOH -> K_2SO_4 + 2H_2O?

Jan 16, 2016

$4$

#### Explanation:

Sulphuric acid contains hydrogen , sulphur and oxygen .

Potassium hydroxide contains potassium , oxygen and hydrogen.

The same elements occur in the reactants and products in different combinations etc.