Question

Write a net ionic equation for the formation of calcium oxalate that results when a solution of calcium bromide is mixed with a solution of sodium oxalate.

Answer 1

The net ionic equation is; Ca^2+(aq) +  C2O4^2-(aq) -----> CaC2O4(s).

First of all we must write the molecular reaction equation;

CaBr2(aq) + Na2C2O4(aq) -------> CaC2O4(s) + 2NaBr(aq)

Then we write the complete ionic equation as follows;

Ca^2+(aq) + 2Br^-(aq) + 2Na^+(aq) + C2O4^2-(aq) -----> CaC2O4(s) +  2Na^+(aq) +  2Br^-(aq)

We can now write the net ionic equation as follows;

Ca^2+(aq) +  C2O4^2-(aq) -----> CaC2O4(s)

The net ionic equation eliminates the spectator ions and only shows the ions that underwent change in the reaction.

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