RSCC CHEM 1120 - CHEM 1120 Test 1 (24 pages)

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CHEM 1120 Test 1



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CHEM 1120 Test 1

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Pages:
24
School:
Roane State Community College
Course:
Chem 1120 - General Chemistry II
General Chemistry II Documents

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Page 1 CHEM 1120 test 1 Spring 2006 Circle the correct answer on the answer sheet Use the equilibrium constants on the sheet attached 1 Calculate the pH of a 0 045 M solution of HNO3 a 13 70 pH log H 3O pH log 0 045 pH 1 35 b 12 40 c 7 00 d 1 35 e 1 00 Page 2 CHEM 1120 test 1 Spring 2006 2 Calculate the pH of a 0 050 M solution of LiOH a 1 00 pOH log OH b 1 60 pOH log 0 050 pOH 1 30 pH 14 00 pOH pH 12 70 c 7 00 d 12 70 e 13 70 Page 3 CHEM 1120 test 1 Spring 2006 3 Calculate the pH of a 0 025 M solution of NaClO4 a 1 00 b 1 60 c 7 00 Na is the cation of a strong base ClO4 is the anion of a strong acid both are therefore spectator ions and the solution is neutral d 12 40 e 13 70 Page 4 CHEM 1120 test 1 Spring 2006 4 Calculate the pH of a 2 0 M solution of HF a 0 30 b 0 70 c 1 05 d 1 45 e 11 95 HF is a weak acid From the table Ka 6 3 10 4 HF H2O F H3O before at equilibrium F H 3O Ka HF x2 6 3 10 2 0 x x 3 55 10 2 pH 1 45 4 HF F H3O 2 0 0 0 2 0 x x x Page 5 CHEM 1120 test 1 Spring 2006 5 Calculate the pH of a 1 0 M solution of H2NNH2 a 12 49 c 7 00 b 11 04 d 2 96 e 1 51 H2NNH2 is a weak baserom the table Kb 1 2 10 6 H2NNH2 H2O H2NNH3 OH H2NNH2 H2NNH3 OH 1 0 0 0 1 0 x x x before at equilibrium H 2 NNH 3 OH Kb H 2 NNH 2 x2 1 2 10 1 0 x x 1 1 10 3 pOH 2 96 6 pH 14 00 pOH pH 11 04 Page 6 CHEM 1120 test 1 Spring 2006 6 Calculate the pH of a solution in contact with solid Mg OH 2 No other ions are present in the water a 1 44 b 4 48 c 7 00 d 9 52 e 10 46 Mg OH 2 s Mg2 2OHKsp 1 2 10 11 X Mg OH 2 s Mg2 OH before 1 0 0 at equilibrium 1 x 2x K sp Mg OH 2 1 2 10 11 x 2 x 1 2 10 11 4 x 3 x 1 44 10 4 OH 2 x OH 2 9 10 4 pOH 3 54 pH 10 46 2 Page 7 CHEM 1120 test 1 Spring 2006 7 What is the molar solubility of BaF2 a 7 5 10 3 b 4 2 10 16 c 1



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