Question

Write the formula of the following compounds by the criss- cross method:

a) Potassium carbonate

b) Ammonium phosphate

c) Magnesium bicarbonate

Answer 1

(a) potassium carbonate→

K. CO3

+1. 2-

hence the formula will be K2CO3

(b)Ammonium phosphate →

NH4. PO4

+1. 3-

hence the formula will be (NH4)3PO4

(c) Magnesium bicarbonate

Mg. HCO3

+2. 1-

hence the formula will be Mg(HCO3)2

hope it helps you