how to find the chemical formula for calcium hydrogen carbonate through cross multiplication

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Solution

Valency of Calcium = 2
Valency of Hydrogencarbonate ion = -1
Elements/Ions: Ca HCO₃^-
Valencies: +2 -1
Formula for calcium hydrogencarbonate can be worked out by crossing over the valencies of the constituent elements/ions. 2 negatively (-1) charged hydrogencarbonate ions are needed to neutralize the +2 charge of calcium ion.
Therefore, formula for calcium hydrogencarbonate is: Ca(HCO₃)₂.

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