CH223_Ch_04_Units_and_Conc (1)

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Oct 30, 2023

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Chapter 4 – Units and Concentrations Know these!
Know the prefixes marked with
Solution Concentration Units (1) Molar Concentration - Analytical Molarity = c x = Concentration Used in Solution Preparation Equilibrium Molarity = [X] = Concentration at Equilibrium ex) Dissolve 1.0 mol of HCl in water to a total volume of 1.0 L. What are c HCl and [HCl] ?
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Solution Concentration Units (2) Percent Concentration - (w/w) = x 100 % (v/v) = x 100 % (w/v) = x 100 % Important to specify which % is being used. If not specified, assume Weight %.
Solution Concentration Units (3) Parts per million, ppm - ppm = x 10 6 ppm 6 2.78 ppm Cd = 2.78 x 10 6 For dilute aqueous solutions only:
Solution Concentration Units (4) p Functions - Ex: [H + ] = 1.00 x 10 4 M pH = log(1.00 x 10 4 ) = 4.000 Note the significant figures! To review sig figs, see pages 115-117 in your book.
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Density (d) and Specific Gravity For conversion between mass and volume: Usually units of g/mL Specific gravity is unitless. At 4 C, d of water = 1.00 g/ml (volume mass). For situations where density is very close to 1.0 g/mL, density and specific gravity are interchangeable.
In-Class Problem 1 Describe the preparation of 200.0 mL of 5.00 M H 2 SO 4 from concentrated H 2 SO 4 . From Page 74 of your book:
In-Class Problem 2 How many grams of KOH are needed to react completely with 10.0 g of H 2 SO 4 ? Remember: Stoichiometry - molar relationships
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In-Class Problem 3 Describe the preparation of 5.00 L of 0.0500 M KMnO 4 from the solid reagent.

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