An example of a salt dissolved in water to give acidic solution is

Options

A. Ammonium chloride
B. Sodium acetate
C. Potassium nitrate
D. Barium bromide

Answer

To determine an example of a salt that, when dissolved in water, gives an acidic solution, we need to analyze the nature of the salts provided in the options.

### Step-by-Step Solution:

1. **Identify the Options**: The options provided are:
- Ammonium chloride (NH4Cl)
- Sodium acetate (CH3COONa)
- Potassium nitrate (KNO3)
- Barium bromide (BaBr2)

2. **Understand Salt Hydrolysis**: When salts dissolve in water, they can undergo hydrolysis, which can produce either acidic, basic, or neutral solutions. The nature of the solution depends on the strength of the acid and base from which the salt is derived:
- **Strong Acid + Weak Base** = Acidic Solution
- **Weak Acid + Strong Base** = Basic Solution
- **Strong Acid + Strong Base** = Neutral Solution

3. **Analyze Each Salt**:
- **Ammonium Chloride (NH4Cl)**:
- NH4Cl dissociates into NH4⁺ and Cl⁻.
- NH4⁺ (from weak base NH3) and Cl⁻ (from strong acid HCl).
- Hydrolysis: NH4⁺ + H2O ⇌ NH3 + H3O⁺ (produces H3O⁺, making the solution acidic).
- **Conclusion**: Ammonium chloride produces an acidic solution.

- **Sodium Acetate (CH3COONa)**:
- CH3COONa dissociates into CH3COO⁻ and Na⁺.
- CH3COO⁻ (from weak acid CH3COOH) and Na⁺ (from strong base NaOH).
- Hydrolysis: CH3COO⁻ + H2O ⇌ CH3COOH + OH⁻ (produces OH⁻, making the solution basic).
- **Conclusion**: Sodium acetate does not produce an acidic solution.

- **Potassium Nitrate (KNO3)**:
- KNO3 dissociates into K⁺ and NO3⁻.
- K⁺ (from strong base KOH) and NO3⁻ (from strong acid HNO3).
- Hydrolysis: K⁺ and NO3⁻ do not hydrolyze significantly.
- **Conclusion**: Potassium nitrate produces a neutral solution.

- **Barium Bromide (BaBr2)**:
- BaBr2 dissociates into Ba²⁺ and Br⁻.
- Ba²⁺ (from strong base Ba(OH)2) and Br⁻ (from strong acid HBr).
- Hydrolysis: Ba²⁺ and Br⁻ do not hydrolyze significantly.
- **Conclusion**: Barium bromide produces a neutral solution.

4. **Final Conclusion**: The only salt that, when dissolved in water, produces an acidic solution is **Ammonium Chloride (NH4Cl)**.

### Final Answer:
**Ammonium Chloride (NH4Cl)** is an example of a salt that dissolves in water to give an acidic solution.

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