Which of the following solution will have no effect on Ph on dilution ?

Options

A. 0.1 M `NH_(4)HS`
B. 5 M `H_(2)CO_(3) +5N NaHCO_(3)`
C. `1 M CH_(3)COONH_(4)`
D. `1 M NH_(4)Cl`

Explanation

To determine which of the following solutions will have no effect on pH upon dilution, we need to identify the buffer solutions among the given options. A buffer solution is a solution that resists changes in pH when small amounts of acid or base are added, or when it is diluted.

### Step-by-Step Solution:

1. **Identify the Solutions:**
- We have four solutions to analyze:
- A) NH4-HS
- B) H2CO3 and NHCO3
- C) NH3-COO-NH4-CH3-COO
- D) NH4-Cl

2. **Analyze Each Solution:**
- **Solution A: NH4-HS**
- This is a salt formed from a weak acid (H2S) and a weak base (NH3). Since it consists of a weak acid and its conjugate base, it acts as a buffer solution.
- **Conclusion:** This solution will have no effect on pH upon dilution.

- **Solution B: H2CO3 and NHCO3**
- H2CO3 (carbonic acid) is a weak acid, and NHCO3 (bicarbonate) is its conjugate base. This combination also forms a buffer solution.
- **Conclusion:** This solution will have no effect on pH upon dilution.

- **Solution C: NH3-COO-NH4-CH3-COO**
- This solution consists of a weak acid (NH4) and a weak base (NH3), which means it also acts as a buffer solution.
- **Conclusion:** This solution will have no effect on pH upon dilution.

- **Solution D: NH4-Cl**
- NH4-Cl is a salt formed from a strong acid (HCl) and a weak base (NH3). This is not a buffer solution as it does not contain both a weak acid and its conjugate base.
- **Conclusion:** This solution will have an effect on pH upon dilution.

3. **Final Answer:**
- The solutions that will have no effect on pH upon dilution are:
- A) NH4-HS
- B) H2CO3 and NHCO3
- C) NH3-COO-NH4-CH3-COO