Concentration%20Slides

Concentration%20Slides - Solutions and Composition A...

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1 Stoichiometry Slide S-20 Solutions and Composition A solution is composed of a solute and a solvent : – Solutions are homogeneous mixtures; – The solute is usually the material present in the lower amount; it can also be thought of as the material that will take part in the chemical reaction you are studying; – The solvent is the material into which the solute is dissolved and is usually present in the larger amount; There are FOUR main ways to express solution composition: ¾ Mass percent ¾ Mole fraction ¾ Molarity ¾ molality Stoichiometry Slide S-21 Concentrated vs. Dilute Solutions • Concentrated Solution: one that has a high level of solute present. • Dilute Solution: one that has a low level of solute present. • Saturated Solution: a solution that contains the maximum amount of solute possible.
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2 Stoichiometry Slide S-22 Mass Percent • Often used to express composition of concentrated solutions; • Simply: • Since mass/mass ratio, no temperature dependence mass solute %1 0 0 %
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Concentration%20Slides - Solutions and Composition A...

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