Back Titration
Hardchemistry
Back titration used when:
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Solution
Incorrect! Answer:
Analyte reacts slowly or incompletely; excess standard added then back-titrated
- The Problem: Sometimes the direct titration between an analyte and a titrant is too slow, lacks a sharp endpoint, or is otherwise incomplete.
- The Procedure: A known, excess amount of a standard reagent is added to the analyte.
- Step 1: Allow the analyte to react completely with the excess reagent.
- Step 2 (The Back Titration): Titrate the remaining (unreacted) amount of that standard reagent with a second standard titrant.
- Calculation: Analyte reacted=Total added−Remaining. This indirect method is common for analyzing insoluble carbonates or amines.
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About This Question
- Subject
- chemistry
- Chapter
- practical chemistry
- Topic
- back titration
- Difficulty
- Hard
- Year
- 2025
Solution
Correct Answer:
Analyte reacts slowly or incompletely; excess standard added then back-titrated
- The Problem: Sometimes the direct titration between an analyte and a titrant is too slow, lacks a sharp endpoint, or is otherwise incomplete.
- The Procedure: A known, excess amount of a standard reagent is added to the analyte.
- Step 1: Allow the analyte to react completely with the excess reagent.
- Step 2 (The Back Titration): Titrate the remaining (unreacted) amount of that standard reagent with a second standard titrant.
- Calculation: Analyte reacted=Total added−Remaining. This indirect method is common for analyzing insoluble carbonates or amines.
This hard difficulty chemistry question is from the chapter practical chemistry, covering the topic of back titration. It appeared in the 2025 exam.
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