Question

Electrochemisry. Candy Chemist wishes to determine the concentration of CrO4^2- by electrochemical means in solution, and subsequently the Ksp of Ag2CrO4. She sets up one half-cell comprised of the Ag+|Ag couple (E=+0.799V) and a second half-cell in which a silver elctrode is coated with Ag2CrO4 (E=+0.446V). This cell may be written as Ag2CrO4+2e- --->2Ag+CrO4^2-

a. Calculate the Ecell for the Ag2CrO4 half-reaction at 25 c when the CrO4^2- = 1.0x10^-5

b. Write the overall spontaneous cell reaction and determine Ecell.

c.When the electrochemical cell is at equilibrium what is Ecell?

d.Calculate the K for the electrochemical cell

e. Write the chemical equilibrium equation associated with Ksp of Ag2CrO4

f. Note that the reaction in b and e are related but not identical therefore determine the Ksp of Ag2CrO4