What are the spectator ions when CoOH3 reacts with H2SO4?

Answer 1

H+ and OH- could be considered the spectator ions in that reaction, although you don't typically count them, because that's just water. Really, this reaction can be summed up by saying: 2Co+3(aq) + 3SO4-2(aq) --> Co2(SO4)3(s). The precipitate is cobalt(III) sulfate.

Answer 2

The spectator ions in the reaction between Co(OH)3 and H2SO4 are the sulfate ions (SO4^2-) since they do not participate in the formation of any new precipitate. The cobalt ions (Co^3+) and hydroxide ions (OH^-) are the ions involved in the reaction to form cobalt sulfate and water.