Final answer:
The net ionic equation for the reaction between zinc carbonate and excess hydroiodic acid is ZnCO3 (s) + 2 H+ (aq) → Zn2+ (aq) + CO2 (g) + H3O+ (aq); it shows the formation of zinc iodide, carbon dioxide gas, and hydronium ion from solid zinc carbonate and hydroiodic acid.
Step-by-step explanation:
The reaction between zinc carbonate (ZnCO3) and hydroiodic acid (HI) involves the zinc carbonate reacting with the excess hydroiodic acid to form zinc iodide (ZnI2), water (H2O), and carbon dioxide (CO2). The net ionic equation for this acid-base reaction can be written by focusing on the species that actually change during the reaction:
ZnCO3 (s) + 2 HI (aq) → ZnI2 (aq) + H2O (l) + CO2 (g)
Breaking down the substances into their respective ions and leaving out the spectator ions, we get the net ionic equation:
ZnCO3 (s) + 2 H+ (aq) → Zn2+ (aq) + CO2 (g) + H3O+ (aq)
Note: Hydroiodic acid is a strong acid, and it dissociates completely in aqueous solution to H+ and I- ions. Since carbon dioxide is a gas, it does not dissociate into ions and zinc carbonate is a solid and does not dissociate into ions in the net ionic equation.