Your lab instructs you to place a few mL of bromine saturatedwater (orange) in a

Question

Your lab instructs you to place a few mL of bromine saturatedwater (orange) in a test tube and add 1 mL of hexane(clear). You are told to stopper and shake the test tube untilmost of the bromine is extracted into the hexane. You are leftwith an upper orange layer and a lower clear layer.

Which layer (upper or lower) contains the hexane?

Which layer contains the bromine ?

You add 1 ml of NaCl to the Bromine/hexane solution and theupper layer changes color.

Which element was oxidized (lost electrons)?
Which element was reduced (gained electrons)?

What was the oxidizing agent?

What was the reducing agent?

Explanation / Answer

The upper layer is orange, thereforecontains the Br2/H2O. Hexane and water do not mix, therefore hexane (which is denser than water) will be on the bottomlayer, and is clear is color. Br2 + NaCl ---> NR Since Br2 cannot be reduced byCl- (Bromine is below Chlorine onthe periodic table. Halogens may onlydisplace and thus be reduced all halogens belowthem). So please clarifythis lab question. This reaction works if we use NaI though 0         -1           -1        0 Br2 + 2I- ---> 2Br- +I2 In this case, using the oxidation numbers (above the reaction inred) we can determine redox components. Br2 is being reduced, and is the oxidizing agent. I- is being oxidized, and is the reducingagent. Na+ is a spectator ion and does not take part in the redox.

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