Laboratory Activity 4.4.3: Studying the reaction of halogens with aqueous sodium hydroxide solution. |
Problem statement: How do chlorine, bromine and iodine react with sodium hydroxide solution?
Hypothesis: Reactivity decreases for the reaction between halogen and sodium hydroxide solution when going down Group 17.
Variable:
» | Fixed variable : sodium hydroxide solution | |
» | Manipulated variable : Type of halogen | |
» | Responding variable : Reactivity of reaction |
Material: » Chlorine gas » Bromine solution » Iodine crystals » Sodium hydroxide solution |
Apparatus: » Rubber stopper » Test tube |
► | The animation below shows the procedures and observation of the experiment.
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► | (A) With chlorine
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► | (B) With bromine
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► | (C) With iodine
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► | Chlorine, bromine and iodine react with sodium hydroxide to form sodium halide, sodium hypohalite and water. | |||
► | Chlorine dissolves quickly in sodium hydroxide solution to produce sodium chloride solution, sodium hypochlorite and
water.
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► | Bromine dissolves less quickly in sodium hydroxide solution to produce sodium bromide solution, sodium hypobromite and
water.
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► | Iodine dissolves slowly in sodium hydroxide solution to produce sodium iodide solution, sodium hypoiodite and water.
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► | The reactivity of the halogens with sodium hydroxide solution decreases when going down Group 17. |
► | Halogens react with sodium hydroxide solution. | |
► | The reactivity increases down the Group 17. | |
► | The hypothesis is accepted. |
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In your conclusion, you state that reactivity INCREASES down group 17, which is incorrect
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