CHemistry- MIDTERM TODAY PLEASE HELP

posted by .

Hey i have a question regarding disproportionate reactions:

Permanganate ions MnO4 reacts with oxalic acid, H2C2O4 in acidic aqueous solution, producing manganese(II) ions and carbon dioxide. The skeletal equation is

MnO4^-(aq)+ H2C2O4(aq)--> Mn^2+(aq)+ Co2 (g)

balance this reaction in acidic solution

So first i write down the 2 half reactions, and balance them

MnO4^-(aq)+ 8H^+ --> Mn^2+(aq)+ 4H2O

and

H2C2O4(aq)+ 2H^+ --> Co2(g)+ 2H20

I know i have to determine the electron charges, this is where i am sure what to do, i am getting confused as to how to add up the electron charges on each side , i know that i have to to that in both the half reaction and cancel them out and get the net ionic equation...can someone please help me understand the electron charges part:

I think MnO4 is oxidizing here, and H2C2O4 is reducing

  • CHemistry- MIDTERM TODAY PLEASE HELP -

    MnO4^-(aq)+ 8H^+ --> Mn^2+(aq)+ 4H2O
    H2C2O4(aq)+ 2H^+ --> CO2(g)+ 2H20
    There are two ways to do it.
    1. Look at the total charge on the left for the first equation. It is -1+8 = +7 and on the right it is +2. So you must add 5 electrons to the left [+7+(-5)=+2] to make it balance. In others words, add electrons to the appropriate side to make the charges balance.

    2. The other way is to look at the oxidation state of Mn on the left. It is +7. On the right Mn is +2. Going from +7 to +2 means it must have gained 5e so you add 5e to the left side. The nice part about either of these tracks is that they always work.

  • CHemistry- MIDTERM TODAY PLEASE HELP -

    I forgot to mention that the H2C2O4 half equation is not balanced the way you have it.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Chemistry Problem

    A student proposes to use visible spectroscopy to measure the kinetics of the permanganate/oxalic acid reaction. The initial permanganate solution was very dark. For a 1 cm sample cell, the absorbance A = 2,500[MnO4]. As a practical …
  2. Chem

    Manganese dioxide reacts with bromide ions to form manganese ions and bromate ions in an acidic aqueous solution. Write the balanced equation for this reaction. 1)Br- + MnO2 + 3H2O --> Mn2+ + BrO3- + 2H3O+ 2)Br- + 3MnO2 + 6H3O+ …
  3. chemistry

    oxalic acid, h2c2o4, is a weak acid capable of providing two H3O+ ions. ka=.059 k2=6.4E-5 the [h3o]+ in a .38 M solution of h2c2o4 is .12M and can be calculated by the first ionization step only. what is the equilibrium concentration …
  4. chemistry

    The reaction of MnO4- with oxalic acid (H2C2O4) in aciic solutiob, yielding Mn2+ and CO2 gas, is widely used to determine the concentration of permanganate solutions. (a) write a balanced equation for the reaction would it be MnO4- …
  5. Chemistry PLEASE HELP!

    Manganese dioxide reacts with bromide ions to form manganese ions and bromate ions in an acidic aqueous solution. Write the balanced equation for this reaction. Select one: a. Br- + MnO2 + 3H2O Mn2+ + BrO3- + 2H3O+ b. Br- + 3MnO2 + …
  6. Chemistry

    24) It was found that a 20.00 mL portion of a solution of oxalic acid, H2C2O4, requires 6.69 mL of 0.200 M K2Cr2O7 for complete reaction in an acidic solution. In the reaction, the oxidation product is CO2 and the reduction product …
  7. Chemistry

    I need chemistry help. I think 1. c, 2.b, & 3.a (please tell me why or why not and help me set up the problems if possible) 1.) The following half reaction has been balanced except for the electrons. How many and where should the electrons …
  8. Chemistry

    Because of the changing color of the solution as the following reaction proceeds, the rate law can be determined by measuring the rate of disappearance of the permanganate ion (MnO4-). 2MnO4-(aq)+ 5H2C2O4(aq) + 6H+(aq) -> 2Mn2+(aq) …
  9. Chemistry

    How do you find the Ka1 and Ka2 of oxalic acid when it is in a solution that is 1.05 M H2C2O4 and has a pH of 0.67. [C2O4^2-] = 5.3x10^-5 M. I have tried using an ICE table for both reactions, as oxalic acid is a diprotic acid, but …
  10. Chemistry

    Oxalic acid, found in the leaves of rhubarb and other plants, is a diprotic acid. H2C2O4 + H2O ↔ H3O+ + HC2O4- Ka1= ?

More Similar Questions