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)
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