Problem: Enter the net ionic equation for the reaction that occurs when aqueous hydroiodic acid and aqueous calcium sulfide are mixed.

FREE Expert Solution

aqueous hydroiodic acid → HI(aq)

aqueous calcium sulfide → CaS(aq)

HI(aq) + NaOH(aq) → 

double displacement reaction:

Reaction:

HI(aq) + CaS(aq) → H2S + CaI2

Product:

H2S

H2→ gaseous

CaI2

I- are soluble except when paired with Ag+, Pb2+, Cu+, Hg22+
▪ CaI2 → soluble → aqueous

Balanced reaction equation: 

2 HI(aq) + CaS(aq) → H2S(g) + CaI2(aq)


For the total ionic equation → soluble ionic compounds (in aqueous form) separate or breaks up and become ions

• Solids, gases, and liquids will not break up since they are insoluble compounds

Total ionic equation:    

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Problem Details

Enter the net ionic equation for the reaction that occurs when aqueous hydroiodic acid and aqueous calcium sulfide are mixed.

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What scientific concept do you need to know in order to solve this problem?

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