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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: Win,odd Dhamnekar on January 22, 2021, 09:49:12 AM

Title: Lewis dot structure of [itex]SO_3[/itex] and Redox reaction question
Post by: Win,odd Dhamnekar on January 22, 2021, 09:49:12 AM

 1] Is following Lewis dot structure of SO₃ wrong? If wrong, why? please explain.

2] Chlorine is used to purify drinking water. Excess of chlorine is harmful. The excess of chlorine is removed by treating with sulphur dioxide. Present a balanced equation for this redox change taking place in water.
 The given redox reaction can be represented as:
Cl₂(s) +SO₂(aq) + H₂O(l)  :rarrow: Cl^-(aq) + SO₄^2-

Now in the above reaction, if we show on the product side SO₃ and balance this  redox reaction, is that correct, useful and practical?

If we use SO₃ on the product side of the above-mentioned redox reaction, the net reaction would be as follows:
Cl₂(s) + SO₂(aq) +H₂O(l) :rarrow: 2Cl^-(aq) + SO₃(aq) +2H⁺

Title: Re: Lewis dot structure of [itex]SO_3[/itex] and Redox reaction question
Post by: Win,odd Dhamnekar on January 23, 2021, 04:38:22 AM

Quote from: Win,odd Dhamnekar on January 22, 2021, 09:49:12 AM

1] Is following Lewis dot structure of SO₃ wrong? If wrong, why? please explain.

2] Chlorine is used to purify drinking water. Excess of chlorine is harmful. The excess of chlorine is removed by treating with sulphur dioxide. Present a balanced equation for this redox change taking place in water.
 The given redox reaction can be represented as:
Cl₂(s) +SO₂(aq) + H₂O(l)  :rarrow: Cl^-(aq) + SO₄^2-

Now in the above reaction, if we show on the product side SO₃ and balance this  redox reaction, is that correct, useful and practical?

If we use SO₃ on the product side of the above-mentioned redox reaction, the net reaction would be as follows:
Cl₂(s) + SO₂(aq) +H₂O(l) :rarrow: 2Cl^-(aq) + SO₃(aq) +2H⁺

 If there is SO₄^2- on the product side of the unbalanced redox equation, then the net reaction would be as follows:
Cl₂(s) + SO₂(aq) +2H₂O(l)  :rarrow: 2Cl^-(aq) + SO₄^2-(aq) +4H⁺

Are both reactions practical?

Title: Re: Lewis dot structure of [itex]SO_3[/itex] and Redox reaction question
Post by: AWK on January 23, 2021, 05:30:26 AM

SO3 (aq) is nonsense. You go back to the time when acid anhydrides were considered acids, about 200 years ago.
When asked about your reaction

Quote

Cl2(s) + SO2(aq) +2H2O(l)  :rarrow: 2Cl-(aq) + SO42-(aq) +4H+

you answered yourself earlier - purification of drinking water.