@sciencecauldron: Blue flame of aluminum foil. Hydrochloric acid and copper sulfate #chemistry #experiment #reaction 1. Put 5-7 grams of copper (II) sulfate into a glass. 2. Pour 100 ml of hydrochloric acid to the salt and stir. 3. Place a ball of foil in the mixture. 4. Set the bubbles on fire. The bright coloration of the solution is due to the formation of the tetrachlorocuprate ion. This complex ion (tetrachlorocuprate) easily destroys the oxide film, which protects aluminium from chemical exposure. The aluminum partially reacts with hydrochloric acid, while another part of metal displaces copper from the salt solution. The released hydrogen burns in the air with the blue flame. The flame colour is caused by the presence of copper ions in the solution.

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