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During the iodometric standardization of sodium thiosulfate (Na2S2O3) with potassium dichromate (K2Cr2O7), what is the equivalent weight of K2Cr2O7?

1. Molecular mass divided by 2
2. Molecular mass divided by 6
3. Molecular mass divided by 3
4. Equal to its molecular mass

Correct answer: Molecular mass divided by 6

Solution

The equivalent weight of potassium dichromate (K2Cr2O7) is calculated based on its ability to provide 6 moles of electrons in redox reactions, which is why its molecular mass is divided by 6 to find the equivalent weight.

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