151disc07 molarity D2L

# 151disc07 molarity D2L - 7 meeting th Welcome to your Chem...

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1 Welcome to your Welcome to your Chem 151 Chem 151 Discussion. Discussion. Where chemistry comes to you! Where chemistry comes to you! 7 th meeting

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So….Form a team of 4 Try to have at least one laptop per group…
Chemistry uses many concentration units molarity F o r m a l i t y % by mass No rm a li ty % b v u e Parts per million PPM

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Chemistry uses many concentration units molarity F o r m a l i t y % by mass No rm a li ty % b v u e Molarity is a unit To describe the Transfer of materials. HOW MUCH do I have?
Molarity is M = moles of solute ( thing dissolved) Liters of Solution Mo la rity is  no t e xa c tly “m o le s   pe r lite r” (m o le s  o f wha t pe r lite r o f  wha t? )

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Let’s make some solutions If you dissolve 133 g of solid NaCl in water and dilute the solution to exactly 1.00 L what is the Molarity? Molarity = Moles (NaCl)/ Liters of solution) 133 g NaCl / 58.44 g/mol = 2.28 mol NaCl M = 2.28/ 1.00 = 2.28 M
Let’s make some solutions Describe how you would prepare 1.00 x 10 2 mL of 0.500M KCl From the dry powder and solvent Molarity = Moles (KCl)/ Liters of solution) Mol (KCl) = M x V = 0.500 x 0.100 L = 0.0500 mol Grams = MM x moles = 74.55 x 0.0500 = 3.73 g So dissolve 3.73 grams and dilute to 100. mL

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Let’s make some solutions Nitric Acid is purchased in a concentrated liquid form that is 70.3% HNO 3 with a density of 1.41 g/mL Describe how you would prepare 1.15 L of 0.100M HNO 3 from the conc. solution.
Nitric Acid liquid -- 70.3% HNO 3 density of 1.41 g/mL Describe how you would prepare 1.15 L of 0.100M HNO 3 from the conc. solution. How much HNO

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## This note was uploaded on 02/06/2012 for the course CHEM 151 taught by Professor Staff during the Fall '08 term at Arizona.

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151disc07 molarity D2L - 7 meeting th Welcome to your Chem...

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