Question

Write a net ionic equation for the reaction that occurs when excess hydrochloric acid (aq) and chromium(II) sulfide are combined. Write a net ionic equation for the reaction that occurs when sodium sulfite (aq) and excess hydroiodic acid are combined. Note: Sulfites follow the same solubility trends as sulfates.

Answer 1

The net ionic equation for the reaction between hydrochloric acid and chromium(II) sulfide is CrS (s) + 2 H+ (aq) → Cr2+ (aq) + H2S (g). For the reaction between sodium sulfite and excess hydroiodic acid, it is SO32- (aq) + 2 H+ (aq) → H2O (l) + SO2 (g).

Step-by-step explanation:

To write a net ionic equation for the reaction between excess hydrochloric acid (HCl) and chromium(II) sulfide (CrS), you first need to write the balanced chemical equation, then the full ionic equation, and finally you can derive the net ionic equation by removing the spectator ions.

The net ionic equation for the reaction between HCl and CrS is given as:
CrS (s) + 2 H+ (aq) → Cr2+ (aq) + H2S (g)

For the reaction between sodium sulfite (Na2SO3) and excess hydroiodic acid (HI), the net ionic equation is:

SO32- (aq) + 2 H+ (aq) → H2O (l) + SO2 (g)