Question

Chlorine with potassium iodide and potassium bromide solutions Take 5 mL of 0.20 mol L?¹ potassium iodide solution in a test tube and add no more than 10 to 20 drops of chlorine water (water through which Cl? gas has been passed). Record your observations. Repeat this experiment using 5 mL of 0.20 mol L?¹ potassium bromide instead of potassium iodide. Again, record your observations. Now add 3 mL of FLAMMABLE petroleum ether to each test tube and shake the two-phase mixtures by flicking the base of the test tubes several times. Record the colours of the upper organic phases. The colours are characteristic of molecular iodine and bromine in hydrocarbon solvents. Colour of solution after adding Cl?(aq) with KI solution: Orange with KBr solution: Yellow Colour of organic phase after extraction with KI sample: Pink with KBr sample: Light Orange 1. What is the balanced net ionic equations for the reactions of chlorine with iodide and bromide ions? Net reaction with I? Net reaction with Br? 2. What have you have learnt from the colour changes and net reaction equations above?

          Chlorine with potassium iodide and potassium bromide solutions

Take 5 mL of 0.20 mol L?¹ potassium iodide solution in a test tube and add no more than 10 to 20 drops of chlorine water (water through which Cl? gas has been passed). Record your observations.
Repeat this experiment using 5 mL of 0.20 mol L?¹ potassium bromide instead of potassium iodide. Again, record your observations.

Now add 3 mL of FLAMMABLE petroleum ether to each test tube and shake the two-phase mixtures by flicking the base of the test tubes several times. Record the colours of the upper organic phases. The colours are characteristic of molecular iodine and bromine in hydrocarbon solvents.

Colour of solution after adding Cl?(aq)
with KI solution: Orange
with KBr solution: Yellow

Colour of organic phase after extraction
with KI sample: Pink
with KBr sample: Light Orange

1. What is the balanced net ionic equations for the reactions of chlorine with iodide and bromide ions?

Net reaction with I?

Net reaction with Br?

2. What have you have learnt from the colour changes and net reaction equations above?

Chlorine with potassium iodide and potassium bromide solutions

Take 5 mL of 0.20 mol L?¹ potassium iodide solution in a test tube and add no more than 10 to 20 drops of chlorine water (water through which Cl? gas has been passed). Record your observations.
Repeat this experiment using 5 mL of 0.20 mol L?¹ potassium bromide instead of potassium iodide. Again, record your observations.

Now add 3 mL of FLAMMABLE petroleum ether to each test tube and shake the two-phase mixtures by flicking the base of the test tubes several times. Record the colours of the upper organic phases. The colours are characteristic of molecular iodine and bromine in hydrocarbon solvents.

Colour of solution after adding Cl?(aq)
with KI solution: Orange
with KBr solution: Yellow

Colour of organic phase after extraction
with KI sample: Pink
with KBr sample: Light Orange

1. What is the balanced net ionic equations for the reactions of chlorine with iodide and bromide ions?

Net reaction with I?

Net reaction with Br?

2. What have you have learnt from the colour changes and net reaction equations above?

Added by Michael C.

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