In the laboratory titration of potassium dichromate ( ) with acidified Mohr's salt solution, which specific indicator is commonly used to mark the end point?

Question

In the laboratory titration of potassium dichromate ( $K_2Cr_2O_7$ ) with acidified Mohr's salt solution, which specific indicator is commonly used to mark the end point?

Prashant Kotian · Accepted Answer

Correct answer: C. is not a strong enough self-indicator because its color change from orange ( ) to green ( ) is too gradual to mark a sharp visual end point. It requires an external redox indicator like diphenylamine, which turns an intense blue color.

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