[Senobim]

Hello guys, i got stuck on a problem

Na2S2O3 + H2O + Cl2 ---> Na2SO4 + NaCl + HCL

S2O32- + 5H2O -----> 2SO42- + 10H+ + 8e |x1
      Cl2 +2e     ----->  2Cl-                              |x4

S2O32- + 5H2O + 4Cl2 ----> 2SO42- + 10H+ + 8Cl-

And it's not correct and I can't find any mistakes.. Any help would be appreciated..

[Dan]

You half equations and final ionic equation look fine to me (but please format your formulas properly). The problem is that this:

Na2S2O3 + H2O + Cl2 ---> Na2SO4 + NaCl + HCL

is not correct.

[Senobim]

It's from the book, so i doubt that it could be a mistake.
Actually, I got two of them which is impossible to balance for me ;]

In₂S₃ + HNO₃  In(NO₃)₃ + NO₂ + H₂SO₄ + H₂O

[Borek]

It's from the book, so i doubt that it could be a mistake.

It can't be balanced the way it is proposed. Try H₂SO₄ instead of Na₂SO₄.

In2S3 + HNO3 = In(NO3)3 + NO2 + H2SO4 + H2O

But this one is not even difficult if you ask me. S^2- gets oxidized, NO₃^- gets reduced. That's all.

Please learn how to format your formulas, it is really just a click away.

[Senobim]

In₂S₃ + HNO₃    In(NO₃)₃ + NO₂ + H₂SO₄ + H₂O

S^2- + 4H₂O    SO4^2- + 8H⁺ + 8e^- | x 1

NO₃^- + 2H⁺ + e^-     NO₂ + H₂O |x8


S^2- + 4H₂O + 8NO₃^- + 16H⁺  SO4^2- + 8H⁺ + 8NO₂ + 8H₂O

simplify:

S^2- + 8NO₃^- + 7H⁺  SO4^2- + 8NO₂+ 4H₂O

and it's not correct, can't understand what i am doing wrong...

[AWK]

S^2- + 8NO₃^- + 7H⁺  SO4^2- + 8NO₂+ 4H₂O

[ajkoer]

Hello guys, i got stuck on a problem

Na2S2O3 + H2O + Cl2 ---> Na2SO4 + NaCl + HCL

The hydrolysis reactions:
1. 2 Cl2 + 2 HOH <--> 2 HOCl + 2 HCl

Also, decompositions:
2. Na2S2O3 + 2 HCl → 2 NaCl + S + SO2 + H2O

3. Na2S2O3 +  H2SO3 →  Na2SO3 + S + SO2 + H2O

A REDOX:
4. Na2SO3 + 2 HOCl --> 2 HCl + Na2SO4

Adding equation (1), (2) (3) and (4) and cancelling common compounds:
 2 Na2S2O3 + 2 Cl2  + H2O --> 2 NaCl + 2 HCl + Na2SO4 + 2 S + SO2

There is actually multiple answers.