Determine whether a solid forms when solutions containing the following salts are mixed. If so, write the ionic equation and the net ionic equation.
AgNO3(aq) and K2S(aq)

I know that AgS will form an insoluble salt; however, I don't understand how my book got these equations:
Ionic equation: 2Ag+(aq) + 2NO3-(aq) + 2K+(aq) + S-(aq)-- Ag2S(s) + 2K+(aq) +2NO3-(aq)

Net ionic equation: 2Ag+(aq) + S2-(aq) -- Ag2S(s)

Can someone explain to me how they're getting this?

Question

Determine whether a solid forms when solutions containing the following salts are mixed. If so, write the ionic equation and the net ionic equation. 
AgNO3(aq) and K2S(aq)

I know that AgS will form an insoluble salt; however, I don't understand how my book got these equations: 
Ionic equation: 2Ag+(aq) + 2NO3-(aq) + 2K+(aq) + S-(aq)--> Ag2S(s) + 2K+(aq) +2NO3-(aq)

Net ionic equation: 2Ag+(aq) + S2-(aq) --> Ag2S(s)

Can someone explain to me how they're getting this?

wolfe8 · Answer

You break the substances into their ionic parts.