[Review Topics] h Use the References to access important values if needed for th

Question

[Review Topics] h Use the References to access important values if needed for this question. When an aqueous solution of iron (II) iodide, Fel2, is added to an aqueous solution of potassium sulfide, K2S, a precipitate of iron(II) sulfide, FeS, forms. Write a balanced net ionic equation for this reaction. Use the pull-down choices to specify states such as (aq) or (s). If a box is not needed leave it blank. 2req 2req M) 2req Retry Entire Group 3 more group attempts remaining Submit Answer Not Visited 2req

Explanation / Answer

Answer:

The balanced equation is

K2S (aq) + FeI2 (aq) = FeS (S) + 2KI (aq)
complete ionic equation:
2K^+ (aq) + S^-2 (aq) + Fe^+2 (aq) + 2I^- (aq) = FeS (S) + 2K^+(aq) + 2 I^- (aq)

=> In many ionic reactions not all the chemical species undergo a change.

=> The species which do not change are called spectator ions.

=> If you remove the spectator ions from a chemical reaction they produce the net ionic reaction.

Here K^+ and I^- are spectator ions.

So the net ionic equation is

Fe^+2 + S^-2(aq) = FeS (s).

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