Determination of substances. Three numbered tubes contain solutions of potassium carbonate, aluminum chloride, sodium sulfate. Determine where which solution is contained.
To begin with, we pour a small amount of each of the substances into a separate container so that we have several attempts. Then, we add sodium hydroxide to each solution. One of the substances will have a white precipitate. This substance is aluminum chloride, and the precipitate is aluminum hydroxide. Next, we take the remaining two solutions and add calcium chloride to them. Potassium carbonate, when interacting with it, forms a white precipitate (calcium carbonate, CaCO3). And we have the last substance, by the method of elimination, we understand that it is sodium sulfate.
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