Chapter4_2[1]

Chapter4_2[1] - CHEMISTRY 1307 Chapter IV Stoichiometry Quantitative Information about Chemical Reactions 1 Concentrations of Compounds in a

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9/18/2011 1 1 CHEMISTRY 1307 Chapter IV Stoichiometry: Quantitative Information about Chemical Reactions 2 Concentrations of Compounds in a Solution Most chemical studies require quantitative measurements. Experiments involving aqueous solutions are measured in ______________ rather than masses of solids, liquids, or gases. Solution concentration, expressed as _________ , relates the volume of solution in liters to the amount of substance in moles. 3 Concentrations of Compounds in a Solution Solution = ______ + ________ That which is dissolved (lesser amount) That which dissolves (greater amount)
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9/18/2011 2 4 Solutions and Concentration The amount of solute in a solution can be reported in several ways: 1)Percent by ________ (1 g per mL) 2)Percent by _________(10 mL ethanol per 100 mL) 3)___________ (mol per L) – this is the most general and easiest to use! 5 Solutions and Concentration per liter of solution. Molarity: Moles of solute Molarity of X ( c X ) = ______________ L of Solution {units: mol/L } Molarity is a conversion factor that transforms _____________ to _______ and vice–versa. c NaCl = [NaCl] mol NaCl = 1.00 1L = 1.00 M 6 Moles, Liters, & Molarity Molarity _________ _________ Molarity relates mols and volume (L) knowing 2 corners, you can find the 3 rd If you know moles & L, you know Molarity (M) and so on.
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9/18/2011 3 7 Moles, Liters, & Molarity Molarity Volume = ______ mols L moles = _________ mol L mol  __ If you know Molarity and volume, you know moles! If you know mols and molarity, you know volume! L = ________ 8 Moles, Liters, & Molarity Step 1: Calculate moles of NiCl 2 • 6H 2 O 2 2 2 2 1 mol 6H O 6H O 237.7 g    Step 2: Calculate molarity 3 22 1 10 mL 6 H O 0.0841 M 250. mL 1 L PROBLEM: Dissolve 5.00 g of NiCl 2 • 6 H 2 O in enough water to make 250.0 mL of solution. Calculate molarity. 9 Ion Concentrations in a Solution [CuCl 2 ] = 0.30 M = [Cu 2+ ] = 0.30 M [Cl - ] = 2 0.30 M = ______ M CuCl 2 (aq) Cu 2+ (aq) + 2Cl (aq) For every one copper (II) ion in solution, there are ____ chloride ions.
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9/18/2011 4 10 Concentration Problem 33 g Fe(NO ) mol Fe(NO ) 3 mole NO 1 Vol. (L) molar mass mole ratio 3 mole NO 1 L Fe(NO 3 ) 3 (aq) Fe 3+
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This document was uploaded on 10/30/2011 for the course CHEM 1307 at Texas Tech.

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Chapter4_2[1] - CHEMISTRY 1307 Chapter IV Stoichiometry Quantitative Information about Chemical Reactions 1 Concentrations of Compounds in a

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