What Are the Products of NaClO and Na₂SO₃ Reaction?

[IBY]

Homework Statement

Do anyone know the product of:
NaClO+Na_2SO_3

The thing is, while searching online, I found:
Na_2SO_4+NaCl

While the instructor had something along the line of (and he himself isn't sure of the answer, since he is not the one who wrote it):
Cl_2+Na_2SO_4+H_2O
Or something like that. I don't remember how it went exactly.

The only constant between them is the sodium sulfite. So, which is it?

 

[Firelion]

Hi,
I´m not sure which one of the reactions happens but your second equation can`t be right in this form, because you left one of the Na+ out and you still need one Cl-, and one O2-. Where got he the H+ from?

 

[Borek]

These are not full reaction equations, these are just products listed.

Cl₂ is not the product of hypochlorite reduction, Cl^- is. Cl₂ is a strong oxidizng agent, so in the presence of SO₃^2- reaction will not stop at Cl₂.

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methods

 

[IBY]

So, is this right, then?:
NaClO+Na_2SO_3--->Na_2SO_4+Cl^-
It is not balanced, of course, that is something I will do in my own time.

The alternative I got from online research was:
NaClO+Na_2SO_3--->Na_2SO_4+NaCl

But I don't know which one is right.

 

[Borek]

Your first equation - as written - can't be balanced. Equation is balanced when atoms are balanced and CHARGE is balanced - you can't balance charge having it on one side only.

Also note that what really happens here is a reaction between ClO^- and SO₃^2- - Na⁺ are just spectators.

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methods

 

[IBY]

Okay, I balanced the redox equation:
ClO^-+SO^{-2}_3--->SO^{-2}_4+Cl^-

To:

ClO^-+SO^{-2}_3--->Cl^-+SO^{-2}_4

Correction: It looks like after balancing it, things remain the same, since all oxygen is accounted for, there is no need to add water, and so there is no need to balance hydrogen, and charge remains -3 for both sides.

But how does Na come into play?

 

[Firelion]

The Na+ stays as Na+ as long as you don`t dry it. So usually (at least )in school you can ignore it in your equation.

 

[IBY]

Thanks!

 

[Borek]

That's why it is called a spectator - it just sits there and watches others at work

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