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EXERCISE 7
Translate experiments and write reaction equations
Experiments on bromine and iodine
Experiment 1. Extraction of bromine and iodine.

a) A few crystals of KBr are slightly MnO

2

mix the mixture into a test tube

soling. Drop a few drops of concentrated sulfuric acid solution on it and a little

heat. what is observed Write the reaction equations.

b) Conduct a similar reaction with the KJ solution and the iodine is purple

Observe the formation of colored steam. Write the reaction equation.

Experiment 2. Oxidizing properties of bromine.

a) Add a little magnesium, zinc or aluminum powder to the test tube with brominated water.

and shake the test tube. Observe the discoloration of bromine water and explain the cause.

Write the reaction equation.

b) Add 2-3 ml of brominated water to the solution and add 3-4 drops of hydrogen sulfide water.

shake vigorously. What is observed? Write the reaction equation.

Experiment 3. Iodine extraction.

Put 2-3 crystals of potassium iodine and as much manganese (IV) oxide in a dry crucible. 1-2 drops

Add concentrated sulfuric acid. Cover the crucible with a lid or watch glass and asbestos

Put on the grill and heat gently on the burner for 3-4 minutes. After cooling, the crucible

Observe the iodine crystals formed on the cover or on the watch window

write.
EXERCISE 8