Question

NO3- is both a spectator and a participant in the following reaction from part III-2. FeS (s) + 4HNO3 (aq) --> Fe(NO3)3 (aq) + S (s) + NO (g) + H2O (l)

True or False

Answer 1

FeS(s) + 4HNO3(aq) ---> Fe(NO3)3(aq) + S(s) + NO(g) H2O (l)

Spectator ions are the common ions present in product and reactant side
.It can be seen properly when we write complete ionic equation by splitting
compounds in [aq] form to ions . We can not split species
in solid or gas form as they cannot ionize

FeS (s) + 4H+ + 4NO3-(aq) --> Fe3+(aq) + 3NO3-(aq) + S(s)
+ NO(g) +H2O

Above it ids clear that 3 moles of NO3-(aq) is common in
product and reactant side. Hence 3NO3- are spectator
ions. One more NO3- is there in reactant side which is
used up to form NO(g) and H2O(l) ,which is not spectator
ion.

Thus NO3- is both a spectator and a participant ion

Answer : True
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