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Concentration

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Refers to the amount of a substance in a defined space.

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Solution

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A homogeneous mixture of two or more substances.

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Solvent

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Any substance, usually liquid, which is capable of dissolving one or several substances, thus creating a solution.

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Solute

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A substance that is dissolved in a solution.

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Hydroxide Ion

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A diatomic anion with chemical formula OH−.

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Molarity

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A measure of concentration defined as the number of moles of solute per liter of solution.

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Dilution

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The process of reducing the concentration of a solute in a solution, usually by adding more solvent.

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Saturated Solution

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A solution in which no more solute can dissolve at a given temperature.

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Unsaturated Solution

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A solution that can still dissolve more solute at a given temperature.

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Supersaturated Solution

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A solution that contains more solute than can normally dissolve at a given temperature.