The net ionic equation for formation of an aqueous solution of NiI 2 accompanied by evolution of CO 2 gas via mixing solid NiCO 3 and aqueous hydriodic acid is ________. 2NiCO3 (s) HI (aq) 2H2O (l) CO2 (g) 2Ni2 (aq) NiCO3 (s) I- (aq) 2H2O (l) CO2 (g) Ni2 (aq) HI (aq) NiCO3 (s) 2H (aq) H2O (l) CO2 (g) Ni2 (aq) NiCO3 (s) 2HI (aq) 2H2O (l) CO2 (g) NiI2 (aq) NiCO3 (s) 2HI (aq) H2O (l) CO2 (g) Ni2 (aq) 2I- (aq)

Spectator ions are defined as the ions which does not get involved in a chemical equation or they are ions which are found on both the sides of the chemical reaction present in ionic form.

The balanced chemical equation will be:

[tex]NiCO_3(s)+2HI(aq)\rightarrow NiI_2(aq)+CO_2(g)+H_2O(l)[/tex]

The total ionic chemical equation will be:

[tex]NiCO_3(s)+2H^+(aq)+2I^-(aq)\rightarrow Ni^{2+}(aq)+2I^-(aq)+CO_2(g)+H_2O(l)[/tex]

The ions which are present on both the sides of the equation are iodide ions and hence are not involved in net ionic equation.

[tex]NiCO_3(s)+2H^+(aq)\rightarrow Ni^{2+}(aq)+CO_2(g)+H_2O(l)[/tex]