Back Titration

Question

Back titration used when:

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1. **The Problem**: Sometimes the direct titration between an analyte and a titrant is too slow, lacks a sharp endpoint, or is otherwise incomplete.
2. **The Procedure**: A known, **excess amount** of a standard reagent is added to the analyte.
3. **Step 1**: Allow the analyte to react completely with the excess reagent.
4. **Step 2 (The Back Titration)**: Titrate the remaining (unreacted) amount of that standard reagent with a second standard titrant.
5. **Calculation**: $Analyte 	ext{ reacted} = 	ext{Total added} - 	ext{Remaining}$. This indirect method is common for analyzing insoluble carbonates or amines.

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Back Titration

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