2Ag (aq) SO4-2(aq) Ag2SO4(s)
You are left with your net ionic equation of
2Ag (aq) SO42-(aq)>Ag2SO4(s)
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Write out the equation:
AgNO3(aq) K2SO4(aq)>Ag2SO4(s) K2(NO3)2(aq)
Balance the equation:
2 AgNO3(aq) K2SO4(aq)>Ag2SO4(s) K2(NO3)2(aq)
Write out the ions (remember to keep molecules intact):
(2Ag ) (2NO3-) (2K ) (SO42-)>(Ag2SO42-) (2K ) (2NO3-)
Cancel out spectator ions. These are ions that watch the reaction without changing. For this problem 2K