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5. A crystalline substance was listed as water-soluble in a chemistry handbook. A confused chemistry student decided to verif
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This is because a substance dissolves in a particular solvent to a limit. For example, sugar is soluble in water as we all know but this does not mean that you can dissolve 1 kg of sugar in 1 mL of water. There is a limit and in terms of chemistry we call it saturation. The substance does not dissolve completely because the solution has been made saturated. No matter how much more you add there is now an equillibrium established between dissolved and undissolved molecules. So, the student need not to get surprised.

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