Secondary Standard
| Also Known As | Standardized solution, working standard solution, titration secondary standard |
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What is Secondary Standard?
A secondary standard is a standard solution whose concentration has been determined by comparison (standardization) against a primary standard solution, rather than being prepared directly from a pure substance. Secondary standards are used because many reagents useful as titrants cannot be obtained in primary standard grade. Common secondary standards include NaOH (standardized against KHP) and Na₂S₂O₃ (standardized against potassium dichromate).
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
A secondary standard is a standard solution whose concentration has been determined by comparison (standardization) against a primary standard solution, rather than being prepared directly from a pure substance. Secondary standards are used because many reagents useful as titrants cannot be obtained in primary standard grade. Common secondary standards include NaOH (standardized against KHP) and Na₂S₂O₃ (standardized against potassium dichromate).
Volumetric analysis and titrations. Analytical chemistry quality control. Clinical and industrial laboratories. Food and pharmaceutical analysis. Environmental testing. Teaching laboratory analytical chemistry.
Secondary standard solutions may be corrosive (NaOH, HCl), oxidizing (KMnO₄, K₂Cr₂O₇), or toxic (K₂Cr₂O₇ — carcinogenic). Handle with appropriate precautions. Store correctly to prevent decomposition or contamination.