Problem: Identify the spectator ion or ions in: Ba(NO3)2(aq) + K2SO4(aq)  

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Displacement reaction → exchange counterions 

For NO3→ all salts soluble

For SO42- →  insoluble except those of Ca2+, Sr2+, Ba2+, Ag+, and Pb2+

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Identify the spectator ion or ions in: Ba(NO3)2(aq) + K2SO4(aq)

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