Wednesday, June 6, 2007
Wednesday AM
Collect Chapter 3 problem sets
Stoichiometry Quiz #1 (5 pts) + Extra Credit (1 pt per correct response)
Chapter 4
Aqueous Reactions and Solution Stoichiometry
Electrolytes
Precipitates (displacement reactions)
Acid-Base Reactions
3 hrs (of 5)
Redox Reactions
Solution Concentration
Solution Stoichiometry (titrations)
Solution Stoichiometry CDE (during lecture)
Chapter 4 problems, pp. 157-165: 1-10, 14, 20, 22, 24, 26, 30, 34, 40, 46, 47, 48, 50,
52, 56, 60, 62, 68, 78, 84, 106
Chapter 4 problem set is due Friday, June 8
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Wednesday PM
Lab: Conclude Cu-AgNO3 lab
Beginning Question: What is the oxidation state of the copper ion produced?
Weigh Cu coil and beaker of Ag crystals (after retrievel)
Compute the Ag/Cu mole ratios; share and compute a class average
Assign: Answer post-lab questions and complete the lab report; due Thursday, June 7
Lab: Begin Experiment #5: Preparation of a Salt
Beginning Questions
What product is formed during the reaction of CuO and H2SO4?
What is the percent yield for this reaction?
Salt Products
metal + nonmetal (REDOX)
acid + base  salt + water
acid + metal  H2 (g) + salt (REDOX)
acidic oxide + base  salt + H2O
acid + metallic oxide  salt + water
Na + Cl  NaCl
HCl + NaOH  NaCl + H2O
HCl + Mg  H2 (g) + MgCl2
CO2 + 2NaOH  Na2CO3 + H2O
H2SO4 + CuO  CuSO4 + H2O
Groups of 2: each pair varies quantities of reactants
Weigh out between 0.3500 g and 0.5000 g CuO
Dispense between 5.00 mL and 7.50 mL of 6.00 M H2SO4 with 10-mL cylinder
Sample data table below:
FW: CuO = 79.55 g/mol; H2SO4 = 98.08 g/mol
Group Name
Mass of CuO
(grams)
Moles of CuO
0.35
0.35
0.40
0.40
0.45
0.45
0.50
0.50
Volume of 6.0 M
H2SO4
(mL)
Moles of H2SO4
5.00
7.50
5.00
7.50
5.00
7.50
5.00
7.50
In fume hood, cook on hot plate – low heat and cover beaker with watch glass:
control the boiling to minimize splattering
Use ice bath to promote crystallization (Fig. 5-1); observe for 15 minutes.
CAREFUL: Allow no H2O to enter salt beaker from ice bath!
Pre-weigh filter paper; vacuum filtration (Figure 5-2) with buchner funnel;
Rinse product with 5 mL of cold alcohol (2x)
Oven dry overnight; weigh on Thursday and complete the SWH!
Assign
Preparation of a Salt (Experiment #5) report is due Friday, June 8
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