Chemistry_Questions_0041

Chemistry_Questions_0041 - To purchase answers and brief...

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To purchase answers and brief explanations to these 75 problems, email: admin@tutor-homework.com Price: $25 Be sure to mention the file name: Chemistry_Questions_0041.doc Question 1 What are the Brønsted acids in the following reaction? H 2 CO 3 + H 2 O HCO 3 + H 3 O + a. H 2 CO 3 and H 2 O b. HCO 3 and H 2 CO 3 c. H 3 O + and H 2 CO 3 d. H 2 O and H 3 O + e. H 2 O and HCO 3 Question 2 Identify the conjugate base of CH 3 COOH in the following reaction: CH 3 COOH + HSO 4 H 2 SO 4 + CH 3 COO a. HSO 4 b. SO 4 2– c. CH 3 COO d. H 2 SO 4 e. OH Question 3 One liter of an aqueous solution contains 6.02 x 10 21 H 3 O + ions. Therefore, its H 3 O + ion concentration is ________. a. 0.01 mole per liter b. 0.1 mole per liter c. 1 mole per liter d. 6.02 x 10 21 mole per liter e. 6.02 x 10 23 mole per liter Question 4 The OH concentration in 7.5 x 10 –3 M Ca(OH) 2 is ________. a. 7.50 x 10 –3 M b. 1.50 x 10 –2 M c. 1.30 x 10 –12 M d. 1.00 x 10 –7 M e. 1.00 x 10 –14 M
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Question 5 What is the OH ion concentration in 5.2 x 10 –4 M HNO 3 ? a. 1.9 x 10 –11 M b. 1.0 x 10 –7 M c. 5.2 x 10 –4 M d. zero e. 1.0 x 10 –4 M Question 6 Determine the pH of a KOH solution made from 0.251 g KOH and enough water to make 1.00 x 10 2 mL of solution. a. 1.35 b. 2.35 c. 7.00 d. 11.65 e. 12.65 Question 7 Calculate the pH of 3.5 x 10 –3 M HNO 3 . a. –2.46 b. 0.54 c. 2.46 d. 3.00 e. 3.46 Question 8 Calculate the pH of a 0.14 M HNO 2 solution that is 5.7 percent ionized. a. 0.85 b. 1.7 c. 2.1 d. 11.9 e. 13.1 Question 9 Acid strength decreases in the series: strongest HSO 4 > HF > HCN. Which of the following species is the weakest base?
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a. HF b. SO 4 2– c. F d. CN Question 10 Predict the direction in which the equilibrium will lie for the following reaction: H 2 SO 3 ( aq ) + HCO 3 HSO 3 + H 2 CO 3 ( aq ) K a H 2 SO 3 = 1 x 10 –2 K a H 2 CO 3 = 4.2 x 10 –7 a. to the right b. to the left c. in the middle Question 11 Calculate the pH of a 0.021 M NaCN solution, given K a (HCN) = 4.9 x 10 –10 . a. 1.68 b. 3.18 c. 5.49 d. 7.00 e. 10.82 Question 12 If the pH of an acid rainstorm is approximately 3.0, how many times greater is the [H + ] in the rain than in a cup of coffee with a pH 5.0? a. 1000 b. 100 c. 20 d. 1.67 e. 0.60 Question 13 In which one of the following solutions will acetic acid have the greatest percent ionization? a. 0.1 M CH 3 COOH b. 0.1 M CH 3 COOH dissolved in 1.0 M HCl c. 0.1 M CH 3 COOH plus 0.1 M CH 3 COONa d. 0.1 M CH 3 COOH plus 0.2 M CH 3 COONa
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Question 14 Which of the following is the most acidic solution? a. 0.10 M CH 3 COOH and 0.10 M CH 3 COONa b. 0.10 M CH 3 COOH c. 0.10 M HNO 2 d. 0.10 M HNO 2 and 0.10 M NaNO 2 e. 0.10 M CH 3 COONa Question 15 Calculate the pH of a solution that is 0.410 M in HOCl and 0.050 M in NaOCl. K
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This note was uploaded on 12/23/2009 for the course GEN GEN STUDIE taught by Professor Kellyshonttell during the Fall '09 term at University of Washington.

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Chemistry_Questions_0041 - To purchase answers and brief...

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