Question

Give the spectator ions for the reaction that occurs when aqueous solutions of k2s and fe(no3)2 are mixed

Answer 1

Here we have to detect the spectator ions in the reaction between K₂S and Fe(NO₃)₂ in aqueous medium.

The spectator ions in the reaction between K₂S and Fe(NO₃)₂ in aqueous medium are potassium ion (K⁺) and nitrate (NO₃⁻) ions.

The spectator ions are those which remains in same condition before and after any chemical reaction.

The aqueous solution of potassium sulphide (K₂S) remains as K₂S (aq) = 2K⁺ (aq) + S²⁻ (aq).

The aqueous solution of ferrous (II) nitrate [Fe(NO₃)₂] remains as Fe(NO₃)₂ (aq) = Fe²⁺ (aq) + 2NO₃⁻ (aq).

Now if we add the two solutions ferrous sulphide (FeS) and potassium nitrate (KNO₃) is produced. Among these FeS is completely insoluble in water whereas KNO₃ remains in its ionic form.

The reaction is- K₂S (aq) + Fe(NO₃)₂ (aq) = FeS (s) + 2KNO₃ (aq).

The potassium nitrate in water present as - K⁺ and NO₃⁻.

Thus we may conclude that potassium and nitrate ions are the spectator ions in this reaction.

The spectator ions in the reaction is determined.    

Answer 2

$\boxed{{{\text{K}}^ + }{\text{ and NO}}_3^ - }$ ions act as spectator ions when aqueous solutions of ${{\text{K}}_{\text{2}}}{\text{S}}$ and ${\text{Fe}}{\left( {{\text{N}}{{\text{O}}_{\text{3}}}} \right)_{\text{2}}}$ are mixed.

Further explanation:

Spectator ions:

These are the ions present in same form on both sides of the chemical reaction. In other words, these ions cannot affect the reaction equilibrium due to their non-participation in chemical reactions. Since these are not involved in overall chemical reaction, spectator ions are not included while writing net ionic equations for any chemical reaction.

Given information:

We are provided with aqueous solutions of ${{\text{K}}_{\text{2}}}{\text{S}}$ and ${\text{Fe}}{\left( {{\text{N}}{{\text{O}}_{\text{3}}}} \right)_{\text{2}}}$.

To determine:

Spectator ions in mixture of both given solutions

${{\text{K}}_{\text{2}}}{\text{S}}$ is formed by combination of metallic potassium atom and non-metallic sulfur atom so it is an ionic compound. It readily dissociates in water to produce ions as follows:

${{\text{K}}_{\text{2}}}{\text{S}}\left( {aq} \right) \rightleftharpoons 2{{\text{K}}^ + }\left( {aq} \right) + {{\text{S}}^{2 - }}\left( {aq} \right)$  

Dissociation of ${\text{Fe}}{\left( {{\text{N}}{{\text{O}}_{\text{3}}}} \right)_{\text{2}}}$ is shown as follows:

 ${\text{Fe}}{\left( {{\text{N}}{{\text{O}}_{\text{3}}}} \right)_{\text{2}}}\left( {aq} \right) \rightleftharpoons {\text{F}}{{\text{e}}^{2 + }}\left( {aq} \right) + 2{\text{NO}}_3^ - \left( {aq} \right)$

If aqueous solutions of ${{\text{K}}_{\text{2}}}{\text{S}}$ and ${\text{Fe}}{\left( {{\text{N}}{{\text{O}}_{\text{3}}}} \right)_{\text{2}}}$ are mixed together, following reaction takes place:

$2{{\text{K}}^ + }\left( {aq} \right) + {{\text{S}}^{2 - }}\left( {aq} \right) + {\text{F}}{{\text{e}}^{2 + }}\left( {aq} \right) + 2{\text{NO}}_3^ - \left( {aq} \right) \to {\text{FeS}}\left( s \right) + 2{{\text{K}}^ + }\left( {aq} \right) + {\text{NO}}_3^ - \left( {aq} \right)$  

Since ${{\text{K}}^ + }$ and ${\text{NO}}_3^ -$ are present on both the reactant and product side of the chemical reaction, these ions are the spectator ions.

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Answer details:

Grade: High School

Subject: Chemistry

Chapter: Mixtures

Keywords: spectator ions, K2S, K+, NO3-, S2-, Fe2+, Fe(NO3)2, ions, same form, chemical reaction, metallic, non-metallic, potassium, sulfur, 2K+, 2NO3-, FeS, water, dissociate, reaction equilibrium.