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Thermal effects accompanying dissolution
	Students are asked to carry out an experiment in order to observe if the temperature of the water increases, decreases or remains constant when into water are inserted potassium permanganate, sulphuric acid or ammonium nitrate. Level 2 Keywords dissolution, exothermic, endothermic, thermal effects, experiment

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	Factors that favor the dissolution of a solid in water In order to observe the factors that favor the dissolution of a solid into water, students are asked to carry out an experiment in which they are asked to dissolve grains of copper sulphate and dust copper sulphate into water, then to dissolve cobalt chloride into water at a temperature of 20° and at a temperature of 80° and finally to dissolve sodium carbonate into water in two crystallizer tanks.