Question

Calculate the equivalent mass of the potassium dichromate. In acid medium is, Cr2O7+14H+6e gives 2Cr3+7H2O

Answer 1

Answer:

Potassium dichromate (K2Cr2O7) is commonly utilized in redox titration in acidic milieu; it is known as one of the strongest oxidizing agents apart from KMnO4.

Half-reaction of potassium dichromate in acidic media :

Cr2O7 2-(aq) + 14 H+(aq) + 6e- → 2 Cr3+(aq) + 7 H2O(l)

As can be seen in the reaction, K2Cr2O7 gains 6 electrons during redox reaction.

To find out the Equivalent Mass of K2Cr2O7, use the formula :

Equivalent Mass = molecular mass/number of electrons involved.

Since are 6 electrons involved and K2Cr2O7 has molecular mass of = 294.26, thus, the equivalent mass of K2Cr2O7 = 294.26/6 = 49 g/equivalent.

Hope this helps!