Ch400Ch11Nt2 - Chem 400 Ch 11 Lecture Notes Part 2 Solution...

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Chem 400 Ch 11 Lecture Notes Part 2 Solution Composition • Solutions can be concentrated or dilute • A concentrated solution contains a large amount of solute per solvent volume (or weight). • A dilute solution contains very little solute per solvent. How to Calculate the Concentration of Solutions • It is convenient to calculate how much solute is dissolved in the solvent. • There are several different ways of expressing the concentration of the solute. Mass % Concentration Calculations • The mass % (or weight %) is defined as the mass of solute per mass of the overall solution. • Example: If 7.5 g aspirin is dissolved in 742.5 g ethanol, what is the mass % of aspirin? • Your Turn: If you want to make 750. g of a 12.5% solution of isopropyl alcohol in water, how many g of isopropyl alcohol would you need? • Mass-% is really parts of solute per 100 parts of sln • Related to this is parts per million, ppm, and parts per billion, ppb. • ppm and ppb are commonly used in the environmental analytical
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Ch400Ch11Nt2 - Chem 400 Ch 11 Lecture Notes Part 2 Solution...

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