Post a New Question

chemistry

posted by .

In the REDOX reaction in basic solution
Zn-->Zn(OH)4+H2
I know that the first half reaction is
4H20+Zn-->Zn(OH)4 +4H+e

but the second one
is either
2e+2H2O--->H2+2OH
(WHICH IS THE ANSWER GIVEN ON THE WORKSHEET)
OR
2e+2H-->H2
I think both leads to the same answer=

2OH+Zn+2H20-->Zn(OH)4 +H2
but I'm not sure if I should add OH instead of H protons since it is a reaction in basic solution.
Someone can help me?

  • chemistry -

    What is the redox equation you are trying to find the half reactions for?

    Your entire question is confusing because of the "it might be this, but" and "or it might be this, but..."
    If you can clean up the question I can help.
    The correct final equation, which you have written as the last step is correct (if you put the charges on).
    2H2O + Zn + 2OH^- ==>Zn(OH)4^-2 + H2
    In that total redox equation, one half cell is
    Zn ==> Zn^+2 + 2e and the other is
    2OH^- + 2e + 2H2O ==> H2 + 4OH^-

  • chemistry -

    my question is about whether I have to add water or just H to firstly balance the second half reaction

    either
    2e+2H2O--->H2+2OH

    OR
    2e+2H-->H2
    which one is correct for a basic solution reaction ?
    thanks a lot

  • chemistry -

    Oh I see you answered that, So , it is incorrect to add 2H to balance H2 in a basic solution... ?

    Although all the first steps are the same as used in acidic solution?

  • chemistry -

    In basic solution you add OH^- and not H^+. Either will work; e.g., if adding H^+, then you balance the H^+ added with OH^- and it all comes out in the wash.
    However, answer on the worksheet or not, I don't buy that the half cell is
    2e + 2H2O ==> H2 + 2OH^-

    You didn't say what redox equation you are trying to balance. This one comes from
    Zn + OH^- --> Zn(OH)4^-2 + H2 and the two half cells are
    Zn ==> Zn^+2 + 2e and
    OH^- + ....etc.

    The point I'm trying to make is that the H2 gas comes from the base (the OH^- in the initial equation) and not from the H2O which is added as a result of the reaction.

  • chemistry -

    thanks a lot

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. chem

    I need help balancing this redox equation: H2O2 + Ni+2 --> H2O + Ni+3 in basic solution. Here's what I have so far: Ni+2 --> Ni+3 + 1e- H2O2 --> H2O I can't seem to make the second half-reaction balance. If you follow the …
  2. 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= …
  3. Chemistry

    1) Balance this redox reaction using the oxidation-number method. Zn + O2 + HCl ® ZnCl2 + H2O 2) Balance this redox reaction using the half-reaction method. (basic solution) Zn + MnO4- ® Zn(OH)2 + MnO2
  4. Chemistry

    I know nothing about chemistry, but am wondering if someone could help me with these. 1) Balance this redox reaction using the oxidation-number method. Zn + O2 + HCl ® ZnCl2 + H2O 2) Balance this redox reaction using the half-reaction …
  5. chemistry

    The half-life of a reaction was found to be inversely dependent on the concentration of the starting material. Thus, we can say that a. the reaction is zero order b. the reaction is first order c. the reaction is second order d. the …
  6. chemistry

    The half-life of a reaction was found to be inversely dependent on the concentration of the starting material. Thus, we can say that a. the reaction is zero order b. the reaction is first order c. the reaction is second order d. the …
  7. Chemistry(Please check)

    8. The half-life of a reaction was found to be inversely dependent on the concentration of the starting material. Thus, we can say that a. the reaction is zero order b.the reaction is first order c.the reaction is second order d. the …
  8. Chemistry

    In a particular redox reaction, BrO– is oxidized to BrO3– and Cu2 is reduced to Cu . Complete and balance the equation for this reaction in acidic solution. Two half reactions: 1.) Cu^2+ --> Cu^+ 2.) BrO^- --> BrO3^- Balanced: …
  9. Chemistry

    For a particular redox reaction NO is oxidized to NO3^- and Cu^2+ is reduced to Cu^+ . Complete and balance the equation for this reaction in basic solution. We are given this as a guide to start NO + Cu^2+ --> NO3^- + Cu^+ I started …
  10. Chemistry

    for the redox reaction given in the chemical equation Pb(OH)4^2- (aq) + ClO- (aq) --> PbO2 (s) + Cl- (aq) For the oxidation half reaction I got Pb(OH)4^2- (aq) --> PbO2 (s) + 2H2O (l) + 2e- For the reduction half reaction I got …

More Similar Questions

Post a New Question