What sulfate-containing compound forms a white precipitate when chlorine reacts with thiosulfate
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What sulfate-containing compound forms a white precipitate when chlorine reacts with thiosulfate

[From: ] [author: ] [Date: 12-02-16] [Hit: ]
of Sulphur.Na2S4O6 .......
First, I reacted sodium hypochlorite with hydrochloric acid to produce chlorine , then I added the sodium thiosulfate to the resultant solution and it gave me a white precipitate immediately.

I am guessing that chlorine was reduced to chloride and thiosulfate ion was oxidized to sulfate ion.
The sulfate ion , in turn , reacted with one other compound in the mixture ----either leftover hypochlorite , excess chloride Cl- , or sodium ion Na+ to form a white precipitate.

What was the white precipitate?

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You have got it wrong. There are no such ions present which may give a white ppt.
Did you store the chlorine or allowed it to escape.
In this case the acid is reacting with hypo to precipitate whitish yellow ppt. of Sulphur.

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2 NaS2O3 + Cl2 → Na2S4O6 + 2 CI−

Na2S4O6 = Sodium tertathionate ( white ppt )

and since you have water as solvent i guess it's

Na2S4O6 . 2H2O

Sodium tetrathionate dihydrate
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