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Lewis dot structure of [itex]SO_3[/itex] and Redox reaction question

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Win,odd Dhamnekar:
 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) + SO42-

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+

Win,odd Dhamnekar:

--- 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) + SO42-

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+

--- End quote ---

 If there is SO42- 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) + SO42-(aq) +4H+

Are both reactions practical?

AWK:
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+

--- End quote ---
you answered yourself earlier - purification of drinking water.

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