2010Exam2key - Name (8 points):_ 3. Concentrated sulfuric...

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Name (8 points) :__________________________________________ CHEM 1211: Principles of Chemistry I Hour Exam II October 15, 2010 1. For each of the following metathesis reactions, i. Give the products (including phases like aq, s, l, g ), and provide a balanced molecular equation, (1 point each) ii. Write the complete ionic equation (1 point ea.). iii. Write the net ionic equation (1 point ea.). If there is no net reaction, write "N/A". a) Na 2 CO 3 ( aq ) + 2 HC 2 H 3 O 2 ( aq ) 2NaC 2 H 3 O 2 (aq) + H 2 O(l) + CO 2 (g) (One product is a gas) Ionic Equation: 2Na + + CO 3 2- + 2HC 2 H 3 O 2 2Na + + 2C 2 H 3 O 2 ¯ + H 2 O(l) + CO 2 (g) Net Ionic Eq'n: CO 3 2- + 2HC 2 H 3 O 2 2C 2 H 3 O 2 ¯ + H 2 O(l) + CO 2 (g) b) 3 NaOH( aq ) + Fe(NO 3 ) 3 ( aq ) 3NaNO 3 (aq) + Fe(OH) 3 (s) Ionic Equation: 3Na + + 3OH¯ + Fe 3+ + 3NO 3 ¯ 3Na + + 3NO 3 ¯ + Fe(OH) 3 (s) Net Ionic Eq'n: 3Na + + 3OH¯ + Fe 3+ + 3NO 3 ¯ 3Na + + 3NO 3 ¯ + Fe(OH) 3 (s) c) Ca(OH) 2 ( s ) + 2 HNO 3 ( aq ) 2H 2 O(l) + Ca(NO 3 ) 2 (aq) Ionic Equation: Ca(OH) 2 (s) + 2H + + 2NO 3 ¯ 2H 2 O(l) + Ca 2+ + 2NO 3 ¯ Net Ionic Eq'n: Ca(OH) 2 (s) + 2H + 2H 2 O(l) + Ca 2+ 2. A concentrated ammonia solution is 28.0 % NH 3 by mass (i.e. 28.0 g NH 3 /100 g solution) and has a density of 0.898 g/mL at 20°C. a) Use the solution density to determine the concentration of NH 3 in grams per liter. (3 points) 28.0 g NH 3 × 0.898 g sol'n = 251 g NH 3 /L 100 g sol'n 0.001 L b) Calculate the molarity of NH 3 (MM = 17.03 g/mol) in this solution. (3 points) 251 g NH 3
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