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 solve the question "An example of a salt dissolved in water to give an acidic solution is," we need to analyze the given options based on the nature of the salts and the acids and bases they are derived from.

### Step-by-Step Solution:

1. **Understanding the Concept**:
- A salt can produce an acidic solution when it is formed from a strong acid and a weak base. When dissolved in water, the resulting solution will have a pH less than 7.

2. **Analyzing the Options**:
- We will evaluate each option to determine if it meets the criteria of being a salt formed from a strong acid and a weak base.

3. **Option 1: Ammonium Chloride (NH4Cl)**:
- Ammonium chloride is formed from ammonium (NH4+) which is derived from ammonia (NH3), a weak base, and hydrochloric acid (HCl), a strong acid.
- When NH4Cl is dissolved in water, it dissociates into NH4+ and Cl-. The NH4+ ion can react with water to produce H+ ions (making the solution acidic).
- Therefore, NH4Cl will give an acidic solution (pH < 7).

4. **Option 2: Sodium Acetate (CH3COONa)**:
- Sodium acetate is derived from acetic acid (a weak acid) and sodium hydroxide (a strong base).
- When dissolved in water, it produces CH3COO- and Na+. The acetate ion (CH3COO-) does not produce H+ ions; instead, it can accept H+ ions, making the solution basic (pH > 7).
- Thus, this option does not give an acidic solution.

5. **Option 3: Potassium Nitrate (KNO3)**:
- Potassium nitrate is formed from nitric acid (HNO3, a strong acid) and potassium hydroxide (KOH, a strong base).
- When dissolved in water, it produces K+ and NO3-. Both ions do not affect the pH significantly, leading to a neutral solution (pH = 7).
- Therefore, this option does not give an acidic solution.

6. **Option 4: Barium Bromide (BaBr2)**:
- Barium bromide is formed from barium hydroxide (Ba(OH)2, a strong base) and hydrobromic acid (HBr, a strong acid).
- When dissolved in water, it produces Ba2+ and Br-. Similar to potassium nitrate, this salt will also lead to a neutral solution (pH = 7).
- Thus, this option does not give an acidic solution.

7. **Conclusion**:
- The only salt among the options that dissolves in water to give an acidic solution is **Option 1: Ammonium Chloride (NH4Cl)**.

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