Gen chem Destroyer #23

[Blackjack21]

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The questions asks about what salt will form an acid solution.....and from my understanding youre supposed to remove the spectator ions, which are basically anything that is water soluble. In that case wont NH4NO3 both be spectators since theyre both water soluble, and the solution says only nitrate is a spectator? Also how come AlCl3 and CH3COOK form an acid and base respectively? Thanks