Solving Potassium Dichromate Homework Problem

[Quantum Mind]

Homework Statement

How many grams of potassium di chromate (K2Cr2O7) are present in 1 lit of its N/10 solution in acid medium?

Homework Equations

gram eq = NV = g/E = xg/M

The Attempt at a Solution

gram eq = NV = 0.1 * 1 = 0.1

g = gram eq * mol wt / valence factor (The valence factor I have taken as 14 because there are 7 oxygen atoms in potassium dichromate, which means in acidic solution there would be 14 H+ atoms)

0.1 * 294 / 14 = 2.1

How to proceed beyond this? The answer is one of the four:4.9, 49, 0.49, 3.9.

 

[Quantum Mind]

OK, got it.

gram eq = no. of grams / Equ. wt

E = mol. wt/val factor = 294.2 / 6 = 49

g.e * E = 4.9.

Is this the answer?

 

[Borek]

Looks OK to me.