
In the reaction \[{{H}_{2}}S\rightleftharpoons 2{{H}^{+}}+{{S}_{2}}^{-}\] when $N{{H}_{4}}OH$ is added, then
A. Sulphide ion is precipitate
B. No action takes place
C. Concentration of sulphide ion decreases
D. Concentration of sulphide ion increases
Answer
161.1k+ views
Hint: A basic species releases hydroxyl ion and an acidic species releases hydrogen ion. Thus when a basic species is added to an acidic species it will neutralise the hydrogen ion and increase the concentration of other ions formed from the acidic or basic species.
Complete Step by Step Answer:
Hydrogen sulphide is a weak acid. It dissociates in solution as hydrogen ion and sulphide ion. The dissociation is given as follows:
\[{{H}_{2}}S\rightleftharpoons 2{{H}^{+}}+{{S}_{2}}^{-}\]
Ammonium hydroxide is a weak base. It dissociates into ammonium ions and hydroxyl ions in solution.
The dissociation is as follows:
\[N{{H}_{4}}OH\rightleftharpoons N{{H}_{4}}^{+}+O{{H}^{-}}\]
Thus in the reaction of hydrogen sulphide when ammonium hydroxide is added the hydroxyl ion will react with the hydrogen ion of the hydrogen sulphide and form water. Thus a neutralisation reaction takes place. So, the concentration of the corresponding sulphide ion increases.
So, we can say that in the reaction of hydrogen sulphide when ammonium hydroxide is added the concentration of the corresponding sulphide ion increases.
Thus the correct option is D.
Note: Ammonium hydroxide is a weak base. It acts as an electrolyte in solution. It is prepared by mixing ammonia with water. Hydrogen sulphide is a hydride of sulphur, the group $16$ element.
Complete Step by Step Answer:
Hydrogen sulphide is a weak acid. It dissociates in solution as hydrogen ion and sulphide ion. The dissociation is given as follows:
\[{{H}_{2}}S\rightleftharpoons 2{{H}^{+}}+{{S}_{2}}^{-}\]
Ammonium hydroxide is a weak base. It dissociates into ammonium ions and hydroxyl ions in solution.
The dissociation is as follows:
\[N{{H}_{4}}OH\rightleftharpoons N{{H}_{4}}^{+}+O{{H}^{-}}\]
Thus in the reaction of hydrogen sulphide when ammonium hydroxide is added the hydroxyl ion will react with the hydrogen ion of the hydrogen sulphide and form water. Thus a neutralisation reaction takes place. So, the concentration of the corresponding sulphide ion increases.
So, we can say that in the reaction of hydrogen sulphide when ammonium hydroxide is added the concentration of the corresponding sulphide ion increases.
Thus the correct option is D.
Note: Ammonium hydroxide is a weak base. It acts as an electrolyte in solution. It is prepared by mixing ammonia with water. Hydrogen sulphide is a hydride of sulphur, the group $16$ element.
Recently Updated Pages
JEE Main 2021 July 25 Shift 1 Question Paper with Answer Key

JEE Main 2021 July 22 Shift 2 Question Paper with Answer Key

JEE Main Mock Test Series Class 12 Chemistry for FREE

Classification of Drugs Based on Pharmacological Effect, Drug Action

JEE Electricity and Magnetism Important Concepts and Tips for Exam Preparation

JEE Energetics Important Concepts and Tips for Exam Preparation

Trending doubts
JEE Main 2025 Session 2: Application Form (Out), Exam Dates (Released), Eligibility, & More

JEE Main 2025: Derivation of Equation of Trajectory in Physics

Electric Field Due to Uniformly Charged Ring for JEE Main 2025 - Formula and Derivation

Displacement-Time Graph and Velocity-Time Graph for JEE

JEE Main 2026 Syllabus PDF - Download Paper 1 and 2 Syllabus by NTA

JEE Main Eligibility Criteria 2025

Other Pages
JEE Advanced Marks vs Ranks 2025: Understanding Category-wise Qualifying Marks and Previous Year Cut-offs

NCERT Solutions for Class 12 Chemistry Chapter 1 Solutions

JEE Advanced 2025: Dates, Registration, Syllabus, Eligibility Criteria and More

NCERT Solutions for Class 12 Chemistry Chapter 2 Electrochemistry

NCERT Solutions for Class 12 Chemistry Chapter 6 Haloalkanes and Haloarenes

Solutions Class 12 Notes: CBSE Chemistry Chapter 1
