According to the water treatment company Lenntech, \"At ambient temperature brom

Question

According to the water treatment company Lenntech, "At ambient temperature bromine is a brownish-red liquid. It has a similarly colored vapor with an offensive and suffocating odor. It is the only nonmetallic element that is liquid under ordinary conditions, it evaporates easily at standard temperature and pressures in a red vapor that has a strong disagreeable odor resembling that of chlorine." Why should aqueous hydrobromic acid be added dropwise over a period of 5 minutes? What would happen if it was added all at once? Trans-cinnamic acid is the limiting reagent in this reaction, which means there is excess bromine present at the end of the reaction. What happens to the bromine (Br2) when 10% sodium thiosulfate is added at the end of the reaction? Include a balanced equation.

Explanation / Answer

Liquid bromine vapourizes easily. So, if all the bromine is added at once a large amount of fume will be produced which can be extremely hazarous to the person performing the experiment.

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Sodium thiosulphate reacts with excess Br2.The reaction is Br2+ 2Na2S2O3 -----> NaBr + Na2S4O6

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