Potassium Dichromate
In iodometric titration, potassium dichromate is used in:
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About This Question
- Subject
- chemistry
- Chapter
- principles related to practical chemistry
- Topic
- potassium dichromate
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Indirect titration - liberates I₂
Iodometric Titration is an indirect method where iodine is liberated and then titrated.
- Step: The unknown oxidizing agent (like K2Cr2O7) is reacted with an excess of Potassium iodide (KI) in acidic medium. Cr2O72−+14H++6I−→2Cr3++3I2+7H2O
- Step: The liberated Iodine (I2) is then titrated with a standard Sodium thiosulfate (Na2S2O3) solution using starch as an indicator.
- This contrasts with Iodimetric titrations, where iodine is the direct titrant.
This medium difficulty chemistry question is from the chapter principles related to practical chemistry, covering the topic of potassium dichromate. It appeared in the 2025 exam.
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