Question

Chemical formula of ammonium sulphate by cris cross method only

Answer 1

Cross multiply (NH4)2 (SO4)1 = (NH4)2SO4 Magnesium bicarbonate Mg2+ HCO31− Cross multiply Mg1(HCO3)2 = Mg(HCO3)2 Barium nitrate Ba2+ NO3−1 Cross multiply Ba1 (NO3)2 = Ba(NO3)2

Answer 2

Ammonium sulfate formula by criss cross method.

• The compound for which the formula must be worked is ammonium sulfate.
• The substance present in the ammonium sulfate is ammonium ion and sulfate ion.
• The formula and charge of ammonium ion is $(NH_4)^1$ and for sulfate it is $(SO_4)^2$.
• As the charge and formula of ions involved is given, with the help of the criss- cross method, the formula of ammonium sulfate can be worked out through the following steps:

Charge of ammonium $(NH_4)$ = 1

Charge of sulfate $(SO_4)$ = 2

• When the formula and the charge given in the above two equations are cross-multiplied it gives $(NH_4)_2SO_4$.

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