chemistry

posted by .

a current is passed through 500 mL of a solution of CaI2. the following electrode reactions occur:
anode: 2I- ---> I2 + 2e-
cathode: 2H2O + 2e- ---> H2 + 2OH-

after some time, analysis of the solution shows that 35.7 mmol of I2 has been formed.

a) how many faradays of charge have passed through the solution?

b) how many coulombs?

c) what volume of dry H2 at STP has been formed?

d) what is the pH of the solution?

  • chemistry -

    1F will deposit 1 eq I2 or 253.8/2 = 126.9 g I2.
    35.7 mmol = 0.0357 mol or 0.0357 x 2 = 0.0714 equivalents.
    1F x 0.0714 eq/F = 0.0714 F

    There are 96,485 C in 1 F; therefore,
    0.0714 x 96,485 = ?C

    For 35.7 mmol I2 there must be 35.7 mmol H2. You don't have a T listed so I don't know how you correct for the vapor pressure of H2O.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. someone correct my work please? fun, fun chemistry

    Okay. I'm very, very confused. The initial question is: predict the products of the electrolysis of a 1 mol/L solution sodium chloride. This is my work: The four different possible equations are: 2H2o + 2e- -------> H2 + 2OH- (V= …
  2. Chemistry

    During the electrolysis of an aqueous solution of CuSO4 with inert electrodes (A) the anode loses mass and the cathode gains mass. (B) the mass of the anode remains the same but the cathode gains mass. (C) the mass of the anode decreases …
  3. chemistry

    I did an experiment where i put iron nail with zinc metal wrapped around it in agar solution. the solution turned pink. I have to find the anode: anode reaction: cathode (remember, a metal can be an inactive electrode): cathode reaction …
  4. Chemistry

    Im having trouble on a question Im not sure what it is they are asking for. A voltaic cell similar to that shown in Figure 20.5 is constructed. One electrode compartment consists of a silver strip placed in a solution of AgNO3, and …
  5. Chemistry ,Reactions at Electrodes during Electrol

    Reactions at Electrodes during Electrolysis Which half-reaction will take place at the cathode during the electrolysis of molten MgCl2?
  6. ap chemistry

    A voltaic cell made of a Cr electrode in a solution of 1.0 M in Cr 3+ and a gold electrode in a solution that is 1.0 M in Au 3+ . a) Provide the half cell reactions for each of the electrodes. b) Which is the anode and which is the …
  7. Chemistry

    A solution of H2SO4 was electrolyzed using the inert platinum electrodes. A) Write the balanced half-reactions for the anode and cathode in this cell. B) How many coulombs passed through the cell in 90 minutes at 8.0 amperes?
  8. Chemistry: please check

    At which electrode does oxidation occur in a voltaic cell?
  9. chemistry

    "Write equations for the half-reactions that occur at the anode and cathode for the electrolysis of the following aqueous solution: CuBr2(aq)" Possible oxidation reactions: 1. 2Br- -> Br2 + 2e- = -1.09 2. 2H2O -> O2 + 4H+ + 4e- …
  10. chemistry

    Electrolysis is carried out for 2.00 h in the following cell. The platinum cathode which has a mass of 25.0782 g, weighs 25.8639g after the electrolysis. The platinum anode weighs the same before and after the electrolysis. there is …

More Similar Questions