Lecture 14

# Lecture 14 - +2 must be added to 0.010M oxalate (C 2 O 4 2...

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Basic method for problem solving: nderstanding the question 1. Understanding the question. 2. Lay out the parameters regarding this question. 3. Try to use concepts and formulas to find the connections. 4. Solving the question. A bottle of concentrated aqueous sulfuric acid, labeled 98.0 wt%, has a molarity of 18.0 M. In a lab with temperature of 25°C, how many illiliters of water are needed to dilute 1 00 L f sulfuric acid milliliters of water are needed to dilute 1.00 mL of sulfuric acid solution into a solution with a density of 1.20 g/mL (Formal mass of sulfuric acid is 98.079). ) 88 (2)296 (3)356 (4)418 (5) Other (1) 2.88 (2) 2.96 (3) 3.56 (4) 4.18

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hat concentration of Ca 2 ust be added to 0 010M oxalate (C to precipitate 99 0 % What concentration of Ca
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Unformatted text preview: +2 must be added to 0.010M oxalate (C 2 O 4 2 ) to precipitate 99.0 % of the oxalate? K sp = 1.3 x 10 ‐ 8 (1) 1.3 x 10 ‐ 4 (2) 1.8 x 10 ‐ 4 (3) 1.3 x 10 ‐ 8 (4) 3.2 x 10 ‐ 4 (5) other For the a 0.100 M salt solution of NaHA (based on the diprotic acid H 2 A), what would be the [H 2 A] concentration? K a1 = 1.42 10 ‐ 3 K a2 = 2.01 10 ‐ 6 (1) 5.3 x 10 ‐ 5 M (2) 3.3 x 10 ‐ 4 M (3) 7.5 x 10 ‐ 5 M (4) 3.7 x 10 ‐ 3 M (5) other A flask containing 36.8 mL of 0.138 M sodium acetate (NaC 2 H 3 O 2 ) is titrated with 24.9 mL of 0.128 M nitric acid (HNO 3 ). What is the pH of the solution. pK a for etic acid is 4 76 acetic acid is 4.76 (1) 4.98 (2) 9.47 (3) 1.99 (4) 4.53 (5) other...
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## This note was uploaded on 09/10/2009 for the course CHM 3120 taught by Professor Harrison during the Spring '08 term at University of Florida.

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Lecture 14 - +2 must be added to 0.010M oxalate (C 2 O 4 2...

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