In volumetric analysis, standardization is the process of titrating a solution prepared from which type of substance?

• A. A primary standard
• B. A supersaturated solution
• C. A saturated solution
• D. An impure reagent

Answer: (A)

Verified step by step guidance

1. Understand the concept of standardization in volumetric analysis: Standardization is the process of determining the exact concentration of a solution by titrating it against a substance with a known and stable composition.
2. Learn the characteristics of a primary standard: A primary standard is a highly pure substance that is stable, non-hygroscopic, and has a known molar mass. It is used to prepare solutions of accurately known concentration.
3. Compare the options provided: A supersaturated solution, a saturated solution, and an impure reagent do not meet the criteria for a primary standard. These substances are either unstable, impure, or do not have a consistent composition.
4. Recognize why a primary standard is used: The high purity and stability of a primary standard ensure that the titration results are accurate and reliable, which is essential for standardization.
5. Conclude that the correct answer is 'A primary standard,' as it is the substance used to prepare solutions for standardization in volumetric analysis.