What solution is produced when the grains of sodium thiosulfate are heated?
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It can be noted that upon heating with Al3+ containing samples, sodium thiosulfate gives a white-colored precipitate. This is due to the reaction between the aluminium cation and the thiosulfate anion which forms aluminium hydroxide along with sulphur and sulphur dioxide.
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In an endothermic reaction, a substance takes heat from its surroundings. The sodium thiosulfate needs energy to dissolve, so it takes heat from its surroundings, in this case the warm water. The heat is absorbed into the sodium thiosulfate and the water is now cold.
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