Question:
Which among the following salt solution in water shows pH greater than 7?
Which among the following salt solution in water shows pH greater than 7?
Show Hint
Salts of weak acids and strong bases are basic. Common examples: sodium acetate, sodium carbonate, potassium cyanide.
Updated On: Jun 4, 2026
- Sodium acetate
- Sodium sulphate
- Copper sulphate
- Ammonium chloride
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Step 1: Understanding the Question:
We need the salt whose aqueous solution is basic (pH > 7). This occurs for salts derived from a weak acid and a strong base.
Step 2: Key Formula or Approach:
Hydrolysis of salt: - Weak acid + strong base → basic solution. - Strong acid + strong base → neutral. - Strong acid + weak base → acidic. - Weak acid + weak base → depends on \(K_a\) and \(K_b\).
Step 3: Detailed Explanation:
- (A) Sodium acetate (CH\(_3\)COONa): weak acid (acetic) + strong base (NaOH) → basic, pH > 7.
- (B) Sodium sulphate (Na\(_2\)SO\(_4\)): strong acid (H\(_2\)SO\(_4\)) + strong base (NaOH) → neutral, pH = 7.
- (C) Copper sulphate (CuSO\(_4\)): strong acid (H\(_2\)SO\(_4\)) + weak base (Cu(OH)\(_2\)) → acidic, pH < 7.
- (D) Ammonium chloride (NH\(_4\)Cl): strong acid (HCl) + weak base (NH\(_3\)) → acidic, pH < 7.
Step 4: Final Answer:
Sodium acetate gives pH > 7, option (A).
We need the salt whose aqueous solution is basic (pH > 7). This occurs for salts derived from a weak acid and a strong base.
Step 2: Key Formula or Approach:
Hydrolysis of salt: - Weak acid + strong base → basic solution. - Strong acid + strong base → neutral. - Strong acid + weak base → acidic. - Weak acid + weak base → depends on \(K_a\) and \(K_b\).
Step 3: Detailed Explanation:
- (A) Sodium acetate (CH\(_3\)COONa): weak acid (acetic) + strong base (NaOH) → basic, pH > 7.
- (B) Sodium sulphate (Na\(_2\)SO\(_4\)): strong acid (H\(_2\)SO\(_4\)) + strong base (NaOH) → neutral, pH = 7.
- (C) Copper sulphate (CuSO\(_4\)): strong acid (H\(_2\)SO\(_4\)) + weak base (Cu(OH)\(_2\)) → acidic, pH < 7.
- (D) Ammonium chloride (NH\(_4\)Cl): strong acid (HCl) + weak base (NH\(_3\)) → acidic, pH < 7.
Step 4: Final Answer:
Sodium acetate gives pH > 7, option (A).
Was this answer helpful?
0
0
Top MHT CET Chemistry Questions
- The temperature of $32^{\circ}C$ is equivalent to
- The heat of formation of water is $ 260\, kJ $ . How much $ H_2O $ is decomposed by $ 130\, kJ $ of heat ?
- If a metal crystallises in bcc structure with edge length of unit cell $4.29 \times 10^{-8}\, cm$ the radius of metal atom is
- Which of the following oxides can act both as an oxidising agent as well as reducing agent ?
- "The mass and energy both are conserved in an isolated system", is the statement of
View More Questions
Top MHT CET Ionic Equilibrium In Solution Questions
- The degree of dissociation of a $ 0.01\, M $ weak acid is $ 10^{-3} $ . Its $ pOH $ is
- $ 0.1\, M $ solution of which of the following has almost unity degree of dissociation ?
- A solution is made by mixing 100 mL of 0.1 M HCl and 100 mL of 0.2 M NaOH. pH of resulting solution is:
- What will be pH of aqueous salt solution of AB if pKa of weak acid HA is 4 and pKb of weak acid BOH is 5?
- What is the pH of a solution with a hydrogen ion concentration of \(1 \times 10^{-4}\) mol/L?
View More Questions
Top MHT CET Questions
- During r- DNA technology, which one of the following enzymes is used for cleaving DNA molecule ?
- In non uniform circular motion, the ratio of tangential to radial acceleration is (r = radius of circle, $v =$ speed of the particle, $\alpha =$ angular acceleration)
- The temperature of $32^{\circ}C$ is equivalent to
- The line $5x + y - 1 = 0$ coincides with one of the lines given by $5x^2 + xy - kx - 2y + 2 = 0 $ then the value of k is
- The heat of formation of water is $ 260\, kJ $ . How much $ H_2O $ is decomposed by $ 130\, kJ $ of heat ?
View More Questions