The question asks to identify the term for a solution containing a weak acid and its salt.
Defining Buffer Solutions
A solution prepared by mixing a weak acid with the salt of that weak acid (its conjugate base) is known as a buffer solution. These solutions resist changes in pH when small amounts of acid or base are added.
Analyzing Other Options
- Neutral solution: This typically refers to a solution with a pH of 7, like pure water. It does not specifically involve a weak acid and its salt.
- Highly acidic solution: This implies a low pH, usually resulting from a strong acid or a high concentration of a weak acid, not necessarily paired with its salt.
- Basic solution: This indicates a high pH, usually due to the presence of a base. It does not match the description of a weak acid and its salt.
Therefore, a solution of a weak acid and its salt is a buffer solution.
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