Given below are two statements:
Statement (I): Aqueous solution of ammonium carbonate is basic.
Statement (II): Acidic/basic nature of salt solution of a salt of weak acid and weak base depends on \( K_a \) and \( K_b \) value of acid and the base forming it.
In the light of the above statements, choose the most appropriate answer from the options given below:
Statement (I): Aqueous solution of ammonium carbonate is basic.
Statement (II): Acidic/basic nature of salt solution of a salt of weak acid and weak base depends on \( K_a \) and \( K_b \) value of acid and the base forming it.
In the light of the above statements, choose the most appropriate answer from the options given below:
- Both Statement I and Statement II are correct
- Statement I is correct but Statement II is incorrect
- Both Statement I and Statement II are incorrect
- Statement I is incorrect but Statement II is correct
The Correct Option is A
Solution and Explanation
Analysis of two statements is required to determine their validity.
- Statement I: "Aqueous solution of ammonium carbonate is basic."
- Ammonium carbonate is a salt formed from carbonic acid (\(H_2CO_3\)), a weak acid, and ammonia (\(NH_3\)), a weak base.
- In water, ammonium carbonate dissociates into ammonium ions (\(NH_4^+\)) and carbonate ions (\(CO_3^{2-}\)).
- Hydrolysis of the carbonate ion produces hydroxide ions (\(OH^-\)), rendering the solution basic.
- Statement II: "Acidic/basic nature of salt solution of a salt of weak acid and weak base depends on \(K_a\) and \(K_b\) value of acid and the base forming it."
- The pH of a salt solution derived from a weak acid and a weak base is determined by the relative values of the acid dissociation constant (\(K_a\)) of the conjugate acid and the base dissociation constant (\(K_b\)) of the conjugate base.
- If \(K_b>K_a\), the solution is basic. If \(K_a>K_b\), the solution is acidic.
- For ammonium carbonate, the basicity from the carbonate ion's hydrolysis is typically greater than the acidity from the ammonium ion's hydrolysis, resulting in a slightly basic solution.
Both statements are valid.
- Statement I is correct because the hydrolysis of the carbonate ion results in a basic aqueous solution of ammonium carbonate.
- Statement II is correct as it accurately states that the acidic or basic nature of a salt solution formed from a weak acid and a weak base is contingent upon the \(K_a\) and \(K_b\) values of the constituent acid and base.
Conclusion: Both Statement I and Statement II are correct.
Top Questions on Equilibrium
Consider the following equilibrium,
CO(g) + 2H2(g) ↔ CH3OH(g)
0.1 mol of CO along with a catalyst is present in a 2 dm3 flask maintained at 500 K. Hydrogen is introduced into the flask until the pressure is 5 bar and 0.04 mol of CH3OH is formed. The Kp is ____ × 10-3 (nearest integer).
Given: R = 0.08 dm3 bar K-1mol-1
Assume only methanol is formed as the product and the system follows ideal gas behaviour.
- JEE Main - 2025
- Chemistry
- Equilibrium
The pH of a 0.01 M weak acid $\mathrm{HX}\left(\mathrm{K}_{\mathrm{a}}=4 \times 10^{-10}\right)$ is found to be 5 . Now the acid solution is diluted with excess of water so that the pH of the solution changes to 6 . The new concentration of the diluted weak acid is given as $\mathrm{x} \times 10^{-4} \mathrm{M}$. The value of x is _______ (nearest integer).
- JEE Main - 2025
- Chemistry
- Equilibrium
A body of mass $m$ is suspended by two strings making angles $\theta_{1}$ and $\theta_{2}$ with the horizontal ceiling with tensions $\mathrm{T}_{1}$ and $\mathrm{T}_{2}$ simultaneously. $\mathrm{T}_{1}$ and $\mathrm{T}_{2}$ are related by $\mathrm{T}_{1}=\sqrt{3} \mathrm{~T}_{2}$. the angles $\theta_{1}$ and $\theta_{2}$ are
- JEE Main - 2025
- Physics
- Equilibrium
- For the given reaction, choose the correct expression of \(K_c\) from the following: \(Fe_{(aq)}^{3+}+SCN_{(aq)}^{−}⇌(FeSCN)_{(aq)}^{2+}\)
- JEE Main - 2024
- Chemistry
- Equilibrium
- Want to practice more? Try solving extra ecology questions todayView All Questions
