net ionic equation

Question

Write a net ionic equation for the reaction that occurs when solid chromium(II) carbonate is combined with excess aqueous hydroiodic acid .

Be sure to specify states such as (aq) or (s). If a box is not needed leave it blank.

Answer 1

Start with the complete molecular equation:

CrCO₃(s) + 2HI(aq) ==> CrI₂(s) + CO₂(g) + H₂O(l)

For total ionic equation, do not ionize solids, liquids or gases:

CrCO₃(s) + 2H⁺(aq) + 2I^-(aq) ==> Cr²⁺(aq) + 2I^-(aq) + CO₂(g) + H₂O(l) ... total ionic equation

For net ionic equation, cancel or combine any like species:

CrCO₃(s) + 2H⁺ ==> Cr²⁺(aq) + CO₂(g) + H₂O(l) ... net ionic equation