The test tubes under the numbers contain solutions of potassium iodide, potassium hydroxide, potassium chloride. Determine which tube each of these solutions is in.
Qualitative reactions are used to determine substances.
1) The first test tube contains a solution of potassium iodide. When silver nitrate is added to the test tube, a yellow precipitate forms, which gradually darkens in the light.
2). Potassium hydroxide solution is poured into the second test tube. Add copper nitrate solution. As a result of the reaction, a blue precipitate is formed – copper hydroxide.
3). The third test tube contains a potassium chloride solution. The reagent for chloride ions is silver nitrate. As a result of the reaction, a white, curdled, insoluble substance is formed in the third test tube.
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