Chemistry 24 Friday, October 27, 2006

Chemistry 24 Friday, October 27, 2006 - Friday, October 27,...

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Friday, October 27, 2006 Chemistry PART OF THE SOLUTION How can we quantify solutions? What happens on the molecular level when a species dissolves? TEXT: Appendix C1-C4, Sections 10.0-10.2 DEFINITIONS 1. Solution: a. Homogeneous mixture i. Uniform throughout 2. Solute dissolved in solvent Can be g,l,s usually liquid in greatest amount 3. Aqueous solution When water is the solvent QUANTIFYING SOLUTIONS: CONCENTRATION 1. Molarity (M): Moles of solute mol Liter of solution L 2. Dissolve know amount: What is concentration? Need mol solute; L solution “Concentration of KCl is .537 molar” Dissolve 20.0 g of KCl in water to make 500 mL of solution. What is concentration? 20.0g KCl 1 mol 0.2683 mol x = = .537 M =.537 mol/L 74.55 g 0.500 L 500mL 1 L x = 0.500L 1000mL
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Friday, October 27, 2006 3. Have target solution How much solute? M is a conversion factor between mol solute = L solution How many g of KCl are needed to make 150 mL of 0.500 M solution? 0.150 L
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Chemistry 24 Friday, October 27, 2006 - Friday, October 27,...

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