# What is the net ionic equation for formation of an aqueous solution of NiI_2 accompanied by evolution of CO_2 gas and water via mixing solid NiCO_3 and aqueous hydriodic acid?

$C {O}_{3}^{2 -} + 2 {H}_{3} {O}^{+} \rightarrow C {O}_{2} \left(g\right) \uparrow + 3 {H}_{2} O \left(l\right)$
$C {O}_{3}^{2 -} + 2 {H}^{+} \rightarrow C {O}_{2} \left(g\right) \uparrow + {H}_{2} O \left(l\right)$