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Question:

Before and after the reaction, the chemical properties and quality of the water did not change, and the water was the catalyst

Before and after the reaction, the chemical properties and quality of the water did not change, and the water was the catalyst

Answer:

Dry aluminum powder and iodine does not react, there is water to react.
3I2 + 3H2O = 3HI + 3HIO
6HI + 2Al = 2AlI3 + 3H2
3HIO + 3H2 = 3H2O + 3HI
Add the above three types to get: 3I2 + 2Al = 2AlI3

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