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If the solubility of sodium chloride is 36 g/L at 20 °C, and the solubility of iron (III) chloride is 920 g/L at 20 °C, which one would precipitate out of a solution of these two salts?

Sodium chloride would precipitate out.
Iron (III) chloride would precipitate out.
Neither of these two substances would precipitate out.

1 Answer

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Answer: Neither of these two substances would precipitate out.

Explanation: At a specific temperature, the highest quantity of a substance that can be dissolved in a particular solvent is commonly defined as its solubility. At a temperature of 20°C, a maximum of 36 grams of sodium chloride can dissolve in one liter of water, indicating the solubility of sodium chloride to be 36 g/L. In the same vein, at a temperature of 20°C, a maximum of 920 grams of iron (III) chloride can dissolve in one liter of water, indicating a solubility of 920 g/L.

Given that both elements are already dissolved within the solution, there is no basis for speculating that either component may separate out. In the event that the level of substance in the solution surpasses its solubility limit, leading to saturation, the surplus amount would undergo precipitation.

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