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1 (for tutoring, homework help, or help with online classes) 1. chem10b The ph of a 0.10 M solution of a weak base is What is the K b for this base? A B C D E chem10b What is the conjugate acid of NH 3? A. NH 4 + B. NH 2 + C. NH 3 D. NH 4 OH E. NH chem10b The simplest amino acid is glycine. Value
2 4. chem10b Using the data in the table, which of the conjugate bases below is the strongest base? A. ClO - B. F - - C. CHO 2 D. OAc - E. OAc - - and CHO 2 5. chem10b A 0.15 M aqueous solution of the weak acid HA at 25.0 C has a ph of The value of K a for HA is. A B C D E chem10b Calculate the poh of a M aqueous sodium cyanide solution at 25.0 C. K b for CN - is A. 8.8 B. 10 C. 5.2
3 D. 9.3 E chem10b What is the conjugate base of OH -? A. H 3 O + B. H 2 O C. O 2 D. O - E. O 2-8. chem10b Determine the ph of a 0.35 M aqueous solution of CH 3 NH 2 (methylamine). The K b of methylamine is A. 1.9 B. 10 C. 13 D. 12 E chem10b The acid-dissociation constant of hydrocyanic acid (HCN) at 25.0 C is What is the ph of an aqueous solution of M sodium cyanide (NaCN)? A B
4 C D E chem10b The ph of a 0.15 M aqueous solution of NaZ (the sodium salt of HZ) is What is the K a for HZ? A B C D E chem10b The acid-dissociation constant for chlorous acid, HClO 2, at 25.0 C is Calculate the concentration of H + if the initial concentration of acid is 0.10 M. A B C D E chem10b Determine the ph of a 0.15 M aqueous solution of KF. For hydrofluoric acid,
5 A. 8.2 B. 2.3 C. 5.8 D. 12 E chem10b What is the ph of a M aqueous solution of barium hydroxide? A B C D E chem10b What is the ph of an aqueous solution at 25.0 C that contains M hydroxide ion? A B C D E chem10b The conjugate base of HSO 4 - is
6 + A. HSO 4 + B. H 3 SO 4 C. OH - 2- D. SO 4 E. H 2 SO chem10b Which of the following ions will act as a weak base in water? A. Cl - - B. NO 3 C. OH - D. ClO - E. None of the above will act as a weak base in water. 17. chem10b A 0.1 M solution of has a ph of 7.0. A. NaNO 3 B. KF C. Na 2 S D. NaF E. NH 4 Cl 18. chem10b Calculate the poh of a solution at 25.0 C that contains M hydronium ions.
7 A B C D E chem10b The concentration of water in pure water is approximately M. A. 18 B. 55 C. 83 D E chem10b In basic solution,. A. [H 3 O + ] < [OH - ] B. [OH - ] > 7.00 C. [H 3 O + ] = 0 M D. [H 3 O + ] = [OH - ] E. [H 3 O + ] > [OH - ] 1. chem10b A 0.1 M solution of has a ph of 7.0.
8 A. NH 4 Cl B. Na 2 S C. NaF D. NaNO 3 E. KF Score: 1/1 2. chem10b The acid-dissociation constant at 25.0 C for hypochlorous acid (HClO) is At equilibrium, the molarity of H 3 O + in a M solution of HClO is. A B C D E Score: 1/1 3. chem10b In basic solution,. A. [H 3 O + ] = [OH - ] B. [H 3 O + ] < [OH - ] C. [H 3 O + ] = 0 M D. [OH - ] > 7.00 E. [H 3 O + ] > [OH - ] 4. chem10b The K a for HCN is What is the value of K b for CN -?
9 A B C D E chem10b An aqueous solution contains 0.10 M NaOH. The solution is. A. very dilute B. acidic C. highly colored D. basic E. neutral 6. chem10b Calculate the ph of M anilinium hydrochloride (C 6 H 5 NH 3 Cl) solution in water, given that K b for aniline is A B C D E chem10b HZ is a weak acid. An aqueous solution of HZ is prepared by dissolving mol of HZ in sufficient water to yield 1.0 L of solution. The ph of the solution was 4.93 at 25.0 C. The K a of HZ is.
10 A B C D E chem10b Classify the following compounds as weak acids (W) or strong acids (S): hypochlorous acid perchloric acid chloric acid A. W S S B. W W W C. W S W D. S S S E. S W W 9. chem10b When the proton in the COOH group in an amino acid is transferred to the NH 2 group of that same amino acid molecule, a zwitterion is formed. Value 10. chem10b What is the ph of an aqueous solution at 25.0 C in which [OH - ] is M? A
11 B C D E chem10b The base-dissociation constant, K b, for pyridine, C 5 H 5 N, is The acid-dissociation constant, K a, for the pyridinium ion, is. A B C D E Score: 1/1 12. chem10b The K a for formic acid (HCO 2 H) is What is the ph of a 0.35 M aqueous solution of sodium formate (NaHCO 2 )? A. 4.2 B. 11 C. 8.6 D. 3.3 E. 5.4
12 1. chem10b Which one of the following is a Br nsted-lowry acid? A. CH 3 COOH B. HNO 2 C. (CH 3 ) 3 NH + D. HF E. all of the above 2. chem10b What is the poh of a M solution of barium hydroxide? A B C D E chem10b In the reaction BF 3 + F - - BF 4 BF 3 acts as a Br nsted-lowry acid. Value 4. chem10b
13 The conjugate acid of HSO 4 - is A. SO 4 2- B. HSO 4 + C. H 2 SO 4 D. HSO 3 + E. H + 5. chem10b What is the conjugate acid of NH 3? A. NH 2 + B. NH 3 + C. NH 3 D. NH 4 OH + E. NH 4 6. chem10b Nitric acid is a strong acid. This means that. A. HNO 3 does not dissociate at all when it is dissolved in water B. HNO 3 produces a gaseous product when it is neutralized C. HNO 3 dissociates completely to H + (aq) and NO 3 - (aq) when it dissolves in water D. aqueous solutions of HNO 3 contain equal concentrations of H + (aq) and OH - (aq) E. HNO 3 cannot be neutralized by a weak base 7. chem10b
14 The K a of hypochlorous acid (HClO) is at 25 C. What is the % ionization of hypochlorous acid in a aqueous solution of HClO at 25 C A B C D. 14 E chem10b Which solution below has the highest concentration of hydroxide ions? A. ph = 7.00 B. ph = 7.93 C. ph = 3.21 D. ph = 12.6 E. ph = 9.82 Score: 1/1 9. chem10b The K a for formic acid (HCO 2 H) is What is the ph of a 0.35 M aqueous solution of sodium formate (NaHCO 2 )? A. 5.4 B. 11 C. 3.3 D. 4.2 E. 8.6
15 10. chem10b Which one of the following is the weakest acid? A. HClO (K a = ) B. HNO 2 (K a = ) C. HF (K a = ) D. Acetic acid (K a = ) E. HCN (K a = ) 11. chem10b The acid-dissociation constants of sulfurous acid (H 2 SO 3 ) are and at 25.0 C. Calculate the ph of a M aqueous solution of sulfurous acid. A. 1.8 B. 7.2 C. 4.5 D. 1.3 E chem10b What is the ph of an aqueous solution at 25.0 C that contains M hydronium ion? A B C D E. 7.00
16 1. chem10b An aqueous solution contains M NaOH at 25.0 C. The ph of the solution is. A B C D E chem10b The hydride ion, H -, is a stronger base than the hydroxide ion, OH -. The product(s) of the reaction of hydride ion with water is/ are. A. H 2 O 2 (aq) B. no reaction occurs C. OH - (aq) + H 2 (g) D. OH - (aq) + 2H + (aq) E. H 3 O + (aq) Score: 1/1 3. chem10b K a for HF is K b for the fluoride ion is. A B C
17 D E chem10b Calculate the molarity of hydroxide ion in an aqueous solution that has a poh of A B C D E chem10b What is the poh of a M solution of barium hydroxide? A B C D E Score: 1/1 6. chem10b HZ is a weak acid. An aqueous solution of HZ is prepared by dissolving mol of HZ in sufficient water to yield 1.0 L of solution. The ph of the solution was 4.93 at 25.0 C. The K a of HZ is. A B
18 C D E chem10b An aqueous solution contains 0.10 M NaOH. The solution is. A. neutral B. very dilute C. highly colored D. basic E. acidic 8. chem10b A 0.1 M solution of has a ph of 7.0. A. NaNO 3 B. NH 4 Cl C. Na 2 S D. NaF E. KF 9. chem10b The acid-dissociation constants of phosphoric acid (H 3 PO 4 ) are K a1 = , and at What is the molar concentration of phosphate ion in a 2.5 M aqueous solution of phosphoric acid?
19 A B C D E Score: 1/1 10. chem10b What is the concentration (in M) of hydronium ions in a solution at 25.0 C with ph = 4.282? A B C D E chem10b The acid-dissociation constants of sulfurous acid (H 2 SO 3 ) are and 6.4x10^-8 at 25.0 C. Calculate the ph of a M aqueous solution of sulfurous acid. A. 1.3 B. 4.5 C. 1.4 D. 7.2 E chem10b A 0.15 M aqueous solution of the weak acid HA at 25.0 C has a ph of The value of K a for HA is.
20 A B C D E chem10b Calculate the poh of a M aqueous sodium cyanide solution at 25.0 C. K b for CN - is 4.9x10^-10. A. 8.8 B. 9.3 C. 1.1 D. 5.2 E chem10b Calculate the poh of a solution at 25.0 C that contains M hydronium ions. A B C D E. 7.00
21 3. chem10b The molar concentration of hydronium ion in pure water at 25 C is. A B C D E chem10b An acid containing the COOH group is called a carbo-oxy acid. Value 5. chem10b The ph of a 0.55 M aqueous solution of hypobromous acid, HBrO, at 25.0 C is What is the value of K a for HBrO? A B C D E chem10b K a for HF is K b for the fluoride ion is.
22 A B C D E chem10b Using the data in the table, which of the conjugate bases below is the strongest base? A. ClO - B. F - - C. CHO 2 D. OAc - E. OAc - - and CHO 2 8. chem10b Which solution below has the highest concentration of hydroxide ions? A. ph = 9.82 B. ph = 3.21 C. ph = 7.93 D. ph = 12.6 E. ph = chem10b Which one of the following is the weakest acid?
23 A. HCN (K a = ) B. HF (K a = ) C. HClO (K a = ) D. HNO 2 (K a = ) E. Acetic acid (K a = ) 10. chem10b A Bronsted-Lowry acid is defined as a substance that. A. increases [OH - ] when placed in H 2 O B. increases [H + ] when placed in H 2 O C. acts as a proton donor D. acts as a proton acceptor E. decreases [H + ] when placed in H 2 O 11. chem10b The K a of hydrazoic acid (HN 3 ) is at 25.0 C. What is the ph of a 0.35 M aqueous solution of HN3? A. 2.4 B. 11 C D. 2.6 E chem10b
24 Classify the following compounds as weak acids (W) or strong acids (S): nitrous acid hydrochloric acid hydrofluoric acid A. S S S B. S W W C. W S W D. W S S E. W W W
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