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Ch400Ch3LN4 - Chem 400 Chapter 3 Lecture Notes Part 4...

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Chem 400 Chapter 3 Lecture Notes Part 4 Solutions and Concentration Many times in the lab we work with volumes of solutions in mL of L instead of weighing solids out in g. So we talk about the concentration of a substance dissolved or mixed in solution. • First, definitions: Solvent : component in solution which is present in greatest quantity; everything else is mixed in it. Solute : substance in solution which is not present in greatest quantity; may be more than 1 solute; it is mixed in the solvent. What’s the solute and solvent: 25g benzene is mixed with 30g ethanol. One of the most important ways to express concentration is called molarity , or M . Molarity is defined as: M = mol solute L sln = mol / L Note that we usually drop the solute and sln from the units, but remember what they are! Note also that molarity is also a conversion factor, converting between mol of solute and L of solution! • Problems: What’s the molarity of a sln made by mixing 25.0426 g ferric sulfate into enough water to make
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