Which may be added to one litre of water to act a buffer?

Options

A. One mole of `CH_(3)COOH` and one mole of `HCl`
B. One mole of `NH(4)OH` and one mole of `NaOH`.
C. One mole of `NH_(4)Cl` and one mole of `HCl`
D. One mole of `CH_(3)COOH`and `0.5`mole of `NaOH`.

Explanation

To determine which combination can be added to one liter of water to act as a buffer, we need to understand the concept of buffers. Buffers are solutions that resist changes in pH when small amounts of acid or base are added. They typically consist of a weak acid and its conjugate base or a weak base and its conjugate acid.

### Step-by-Step Solution:

1. **Identify the Types of Buffers:**
- There are two types of buffers:
- **Acidic Buffer:** A mixture of a weak acid and its salt (conjugate base).
- **Basic Buffer:** A mixture of a weak base and its salt (conjugate acid).
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