7236322
Pregunta 1
Pregunta
According to the Arrhenius concept, an acid is a substance that __________.
Respuesta
-
A) is capable of donating one or more H+
-
B) causes an increase in the concentration of H+ in aqueous solutions
-
C) can accept a pair of electrons to form a coordinate covalent bond
-
D) reacts with the solvent to form the cation formed by autoionization of that solvent
-
E) tastes bitter
Pregunta 2
Pregunta
A BrØnsted-Lowry base is defined as a substance that __________.
Respuesta
-
A) increases [H+] when placed in H2O
-
B) decreases [H+] when placed in H2O
-
C) increases [OH-] when placed in H2O
-
D) acts as a proton acceptor
-
E) acts as a proton donor
Pregunta 3
Pregunta
A BrØnsted-Lowry acid is defined as a substance that __________.
Respuesta
-
A) increases Ka when placed in H2O
-
B) decreases [H+] when placed in H2O
-
C) increases [OH-] when placed in H2O
-
D) acts as a proton acceptor
-
E) acts as a proton donor
Pregunta 4
Pregunta
Which one of the following is a BrØnsted -Lowry acid?
Respuesta
-
A) (CH3)^3NH+
-
B) CH3COOH
-
C) HF
-
D) HNO2
-
E) all of the above
Pregunta 5
Pregunta
A substance that is capable of acting as both an acid and as a base is __________.
Respuesta
-
A) autosomal
-
B) conjugated
-
C) amphoteric
-
D) saturated
-
E) miscible
Pregunta 6
Pregunta
6) Which one of the following is a BrØnsted -Lowry base?
Respuesta
-
A) (CH3)3N
-
B) CH3COOH
-
C) HF
-
D) HNO2
-
E) none of the above
Pregunta 7
Pregunta
The molar concentration of hydronium ion in pure water at 25°C is __________.
Respuesta
-
A) 0.00
-
B) 1.0 × 10-7
-
C) 1.0 × 10-14
-
D) 1.00
-
E) 7.00
Pregunta 8
Pregunta
The magnitude of Kw indicates that __________.
Respuesta
-
A) water autoionizes very slowly
-
B) water autoionizes very quickly
-
C) water autoionizes only to a very small extent
-
D) the autoionization of water is exothermic
Pregunta 9
Pregunta
In basic solution, __________.
Respuesta
-
A) [H3O+] = [OH-]
-
B) [H3O+] > [OH-]
-
C) [H3O+] < [OH-]
-
D) [H3O+] = 0 M
-
E) [OH-] > 7.00
Pregunta 10
Pregunta
Which solution below has the highest concentration of hydroxide ions?
Respuesta
-
A) pH = 3.21
-
B) pH = 12.6
-
C) pH = 7.93
-
D) pH = 9.82
-
E) pH = 7.00
Pregunta 11
Pregunta
Which solution below has the highest concentration of hydronium ions?
Respuesta
-
A) pH = 3.21
-
B) pH = 12.6
-
C) pH = 7.93
-
D) pH = 9.82
-
E) pH = 7.00
Pregunta 12
Pregunta
Which one of the following statements regarding Kw is false?
Respuesta
-
A) pKw is 14.00 at 25°C
-
B) The value of Kw is always 1.0 × 10-14.
-
C) Kw changes with temperature.
-
D) The value of Kw shows that water is a weak acid.
-
E) Kw is known as the ion product of water.
Pregunta 13
Pregunta
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 __________.
Respuesta
-
A) H3O+ (aq)
-
B) OH- (aq) + H2 (g)
-
C) OH- (aq) + 2H+ (aq)
-
D) no reaction occurs
-
E) H2O2 (aq)
Pregunta 14
Pregunta
An aqueous solution contains 0.10 M NaOH. The solution is __________.
Respuesta
-
A) very dilute
-
B) highly colored
-
C) basic
-
D) neutral
-
E) acidic
Pregunta 15
Pregunta
Nitric acid is a strong acid. This means that __________.
Respuesta
-
A) aqueous solutions of HNO3 contain equal concentrations of H+(aq) and OH-(aq)
-
B) HNO3 does not dissociate at all when it is dissolved in water
-
C) HNO3 dissociates completely to H+(aq) and NO3-(aq) when it dissolves in water
-
D) HNO3 produces a gaseous product when it is neutralized
-
E) HNO3 cannot be neutralized by a weak base
Pregunta 16
Pregunta
Of the following acids, __________ is a strong acid.
Respuesta
-
A) HNO2
-
B) H2CO3
-
C) HBrO3
-
D) HClO
-
E) HF
Pregunta 17
Pregunta
Of the following acids, __________ is not a strong acid.
Respuesta
-
A) HNO2
-
B) H2SO4
-
C) HNO3
-
D) HClO4
-
E) HCl
Pregunta 18
Pregunta
Which one of the following is the weakest acid?
Respuesta
-
A) HF (Ka = 6.8 × 10-4)
-
B) HClO (Ka = 3.0 × 10-8)
-
C) HNO2 (Ka = 4.5 × 10-4)
-
D) HCN (Ka = 4.9 × 10-10)
-
E) Acetic acid (Ka = 1.8 × 10-5)
Pregunta 19
Pregunta
The Ka of hypochlorous acid (HClO) is 3.0 × 10-8 at 25.0°C. What is the % ionization of hypochlorous acid in a 0.015 M aqueous solution of HClO at 25.0°C?
Respuesta
-
A) 4.5 × 10-8
-
B) 14
-
C) 2.1 × 10-5
-
D) 0.14
-
E) 1.4 × 10-3
Pregunta 20
Pregunta
In which of the following aqueous solutions does the weak acid exhibit the highest percentage ionization?
Respuesta
-
A) 0.01 M HC2H3O2 (Ka = 1.8 × 10-5)
-
B) 0.01 M HNO2 (Ka = 4.5 × 10-4)
-
C) 0.01 M HF (Ka = 6.8 × 10-4)
-
D) 0.01 M HClO (Ka = 3.0 × 10-8)
-
E) These will all exhibit the same percentage ionization.
Pregunta 21
Pregunta
In which of the following aqueous solutions does the weak acid exhibit the lowest percentage ionization?
Respuesta
-
A) 0.01 M HC2H3O2 (Ka = 1.8 × 10-5)
-
B) 0.01 M HNO2 (Ka = 4.5 × 10-4)
-
C) 0.01 M HF (Ka = 6.8 × 10-4)
-
D) 0.01 M HClO (Ka = 3.0 × 10-8)
-
E) These will all exhibit the same percentage ionization.
Pregunta 22
Pregunta
HA is a weak acid. Which equilibrium corresponds to the equilibrium constant Kb for A-?
Respuesta
-
A) HA (aq) + H2O (l) --> H2A+ (aq) + OH- (aq)
-
B) A- (aq) + H3O+ (aq) --> HA (aq) + H2O (l)
-
C) HA (aq) + OH- (aq) --> H2O (l) + H+ (aq)
-
D) A- (aq) + H2O (l) --> HA (aq) + OH- (aq)
-
E) A- (aq) + OH- (aq) --> HOA2- (aq)
Pregunta 23
Pregunta
Using the data in the table, which of the conjugate acids below is the weakest acid?
Respuesta
-
A) HClO
-
B) HCO3-
-
C) H2S
-
D) NH3CH3+
-
E) H2S and HClO
Pregunta 24
Pregunta
A 0.0035 M aqueous solution of a particular compound has pH = 2.46. The compound is __________.
Respuesta
-
A) a weak base
-
B) a weak acid
-
C) a strong acid
-
D) a strong base
-
E) a salt
Pregunta 25
Pregunta
Which of the following aqueous solutions has the lowest [OH-]?
Respuesta
-
A) a solution with a pH of 3.0
-
B) a 1 × 10-4 M solution of HNO3
-
C) a solution with a pOH of 12.0
-
D) pure water
-
E) a 1 × 10-3 M solution of NH4Cl
Pregunta 26
Pregunta
Which of the following aqueous solutions has the highest [OH-]?
Respuesta
-
A) a solution with a pH of 3.0
-
B) a 1 × 10-4 M solution of HNO3
-
C) a solution with a pOH of 12.0
-
D) pure water
-
E) a 1 × 10-3 M solution of NH4Cl
Pregunta 27
Pregunta
Of the following substances, an aqueous solution of __________ will form basic solutions.
NH4Cl Cu(NO3)2 K2CO3 NaF
Respuesta
-
A) NH4Cl, Cu(NO3)2
-
B) K2CO3, NH4Cl
-
C) NaF only
-
D) NaF, K2CO3
-
E) NH4Cl only
Pregunta 28
Pregunta
A 0.1 M aqueous solution of __________ will have a pH of 7.0 at 25.0°C.
NaOCl KCl NH4Cl Ca(OAc)2
Respuesta
-
A) NaOCl
-
B) KCl
-
C) NH4Cl
-
D) Ca(OAc)2
-
E) KCl and NH4Cl
Pregunta 29
Pregunta
Of the compounds below, a 0.1 M aqueous solution of __________ will have the highest pH.
Respuesta
-
A) KCN, Ka of HCN = 4.0 × 10-10
-
B) NH4NO3, Kb of NH3 = 1.8 × 10-5
-
C) NaOAc, Ka of HOAc = 1.8 × 10-5
-
D) NaClO, Ka of HClO = 3.2 × 10-8
-
E) NaHS, Kb of HS- = 1.8 × 10-7
Pregunta 30
Pregunta
A 0.1 M solution of __________ has a pH of 7.0.
Respuesta
-
A) Na2S
-
B) KF
-
C) NaNO3
-
D) NH4Cl
-
E) NaF
Pregunta 31
Pregunta
52) An aqueous solution of __________ will produce a basic solution.
Respuesta
-
A) NH4ClO4
-
B) KBr
-
C) NaCl
-
D) NaHSO4
-
E) Na2SO3
Pregunta 32
Pregunta
Of the following, which is the strongest acid?
Respuesta
-
A) HIO
-
B) HIO4
-
C) HIO2
-
D) HIO3
-
E) The acid strength of all of the above is the same.
Pregunta 33
Pregunta
Of the following, which is the weakest acid?
Respuesta
-
A) HIO
-
B) HIO4
-
C) HIO2
-
D) HIO3
-
E) The acid strength of all of the above is the same.
Pregunta 34
Pregunta
Which of the following acids will be the strongest?
Respuesta
-
A) H2SO4
-
B) HSO4-
-
C) H2SO3
-
D) H2SeO4
-
E) HSO3-
Pregunta 35
Pregunta
In the gas phase reaction below, NH3 is acting as a(n) __________ base but not as a(n) __________ base.
Respuesta
-
A) Arrhenius, BrØnsted-Lowry
-
B) BrØnsted-Lowry, Lewis
-
C) Lewis, Arrhenius
-
D) Lewis, BrØnsted-Lowry
-
E) Arrhenius, Lewis
Pregunta 36
Pregunta
What is the conjugate acid of NH3?
Respuesta
-
A) NH3
-
B) NH2+
-
C) NH3+
-
D) NH4+
-
E) NH4OH
Pregunta 37
Pregunta
What is the conjugate acid of CO3-2?
Respuesta
-
A) CO2-2
-
B) HCO2-2
-
C) H2CO3
-
D) HCO3-
-
E) none of the above
Pregunta 38
Pregunta
The conjugate base of HSO4- is __________.
Respuesta
-
A) OH-
-
B) H2SO4
-
C) SO42-
-
D) HSO4+
-
E) H3SO4+
Pregunta 39
Pregunta
The conjugate base of H2PO4- is __________.
Respuesta
-
A) PO4-3
-
B) H2PO4
-
C) H3PO4
-
D) HPO4-2
-
E) none of the above
Pregunta 40
Pregunta
The conjugate acid of HSO4- is __________.
Respuesta
-
A) SO42-
-
B) H2SO4
-
C) HSO4+
-
D) H+
-
E) HSO3+
Pregunta 41
Pregunta
What is the conjugate base of OH-?
Respuesta
-
A) O2
-
B) O-
-
C) H2O
-
D) O2-
-
E) H3O+
Pregunta 42
Pregunta
What is the pOH of an aqueous solution at 25.0 °C that contains 3.98 × 10-9 M hydronium ion?
Respuesta
-
A) 8.400
-
B) 5.600
-
C) 9.000
-
D) 3.980
-
E) 7.000
Pregunta 43
Pregunta
What is the pH of an aqueous solution at 25.0 °C that contains 3.98 × 10-9 M hydroxide ion?
Respuesta
-
A) 8.40
-
B) 5.60
-
C) 9.00
-
D) 3.98
-
E) 7.00
Pregunta 44
Pregunta
What is the pOH of an aqueous solution at 25.0 °C that contains 3.98 × 10-9 M hydroxide ion?
Respuesta
-
A) 8.40
-
B) 5.60
-
C) 9.00
-
D) 3.98
-
E) 7.00
Pregunta 45
Pregunta
Calculate the concentration (in M) of hydronium ions in a solution at 25.0°C with a pOH of 4.223.
Respuesta
-
A) 5.98 × 10-5
-
B) 1.67 × 10-10
-
C) 1.67 × 104
-
D) 5.99 × 10-19
-
E) 1.00 × 10-7
Pregunta 46
Pregunta
An aqueous solution contains 0.100 M NaOH at 25.0°C. The pH of the solution is __________.
Respuesta
-
A) 0.100
-
B) 1.00
-
C) 13.00
-
D) 7.00
-
E) -1.00
Pregunta 47
Pregunta
An aqueous solution contains 0.150 M HCl at 25.0°C. The pH of the solution is __________.
Respuesta
-
A) 0.150
-
B) 1.00
-
C) 13.00
-
D) 7.00
-
E) 0.82
Pregunta 48
Pregunta
HZ is a weak acid. An aqueous solution of HZ is prepared by dissolving 0.020 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 Ka of HZ is
Respuesta
-
A) 1.2 × 10-5
-
B) 6.9 × 10-9
-
C) 1.4 × 10-10
-
D) 9.9 × 10-2
-
E) 2.8 × 10-12
Pregunta 49
Pregunta
The pH of a 0.60 M aqueous solution of formic acid, HCHO2, at 25.0°C is 1.98. What is the value of Ka for formic acid?
Respuesta
-
A) 2.0 × 10-5
-
B) 1.8 × 10-4
-
C) 6.0 × 10-5
-
D) 3.5 × 10-4
-
E) none of the above
Pregunta 50
Pregunta
A 0.15 M aqueous solution of the weak acid HA at 25.0°C has a pH of 5.35. The value of Ka for HA is __________.
Respuesta
-
A) 3.0 × 10-5
-
B) 1.8 × 10-5
-
C) 7.1 × 10-9
-
D) 1.3 × 10-10
-
E) 3.3 × 104
Pregunta 51
Pregunta
The Ka of hypochlorous acid (HClO) is 3.00 × 10-8. What is the pH at 25.0°C of an aqueous solution that is 0.0200 M in HClO?
Respuesta
-
A) +2.45
-
B) -2.45
-
C) -9.22
-
D) +9.22
-
E) +4.61
Pregunta 52
Pregunta
The acid-dissociation constants of sulfurous acid (H2SO3) are Kal = 1.7 × 10-2 and
Ka2 = 6.4 × 10-8 at 25.0°C. Calculate the pH of a 0.163 M aqueous solution of sulfurous acid.
Respuesta
-
A) 4.53
-
B) 1.28
-
C) 1.86
-
D) 6.21
-
E) 1.93
Pregunta 53
Pregunta
The acid-dissociation constants of phosphoric acid (H2PO3) are Kal = 7.5 × 10-3, Ka2 = 6.2 × 10-8, and Ka3 = 4.2 × 10-13 at 25.0°C. What is the pH of a 2.5 M aqueous solution of phosphoric acid?
Respuesta
-
A) 1.82
-
B) 0.40
-
C) 2.51
-
D) 0.86
-
E) 0.13
Pregunta 54
Pregunta
The pH of a 0.55 M aqueous solution ammonia, NH3, at 25.0°C is 11.50. What is the value of Kb for NH3?
Respuesta
-
A) 2.0 × 10-9
-
B) 1.1 × 10-9
-
C) 6.0 × 10-5
-
D) 1.8 × 10-5
-
E) none of the above
Pregunta 55
Pregunta
The pH of a 0.30 M solution of a weak acid is 2.67. What is the Ka for this acid?
Respuesta
-
A) 2.1 × 10-4
-
B) 4.4 × 10-4
-
C) 1.5 × 10-4
-
D) 6.6 × 10-4
-
E) none of the above
Pregunta 56
Pregunta
Z- is a weak base. An aqueous solution of NaZ is prepared by dissolving 0.350 mol of NaZ in sufficient water to yield 1.0 L of solution. The pH of the solution was 8.93 at 25.0°C. The Kb of Z- is __________.
Respuesta
-
A) 1.2 × 10-5
-
B) 6.9 × 10-9
-
C) 2.1 × 10-10
-
D) 9.9 × 10-2
-
E) 2.8 × 10-12
Pregunta 57
Pregunta
The acid-dissociation constant, Ka, for gallic acid is 4.57 × 10-3. What is the base-dissociation constant, Kb, for the gallate ion?
Respuesta
-
A) 4.57 × 10-3
-
B) 2.19 × 10-12
-
C) 5.43 × 10-5
-
D) 7.81 × 10-6
-
E) 2.19 × 102
Pregunta 58
Pregunta
The base-dissociation constant, Kb, for pyridine, C5H5N, is 1.4 × 10-9. The acid-dissociation constant, Ka, for the pyridinium ion, C5H5NH+, is __________.
Respuesta
-
A) 1.0 × 10-7
-
B) 1.4 × 10-23
-
C) 7.1 × 10-4
-
D) 1.4 × 10-5
-
E) 7.1 × 10-6
Pregunta 59
Pregunta
The Ka for HCN is 4.9 × 10-10. What is the value of Kb for CN-?
Respuesta
-
A) 2.0 × 10-5
-
B) 4.0 × 10-6
-
C) 4.9 × 104
-
D) 4.9 × 10-24
-
E) 2.0 × 109
Pregunta 60
Pregunta
The base-dissociation constant of ethylamine (C2H5NH2) is 6.4 × 10-4 at 25.0 °C. The [H+] in
a 1.6 × 10-2 M solution of ethylamine is __________ M.
Respuesta
-
A) 3.5 × 10-12
-
B) 2.9 × 10-3
-
C) 3.1 × 10-12
-
D) 3.2 × 10-3
-
E) 11.46
Pregunta 61
Pregunta
Calculate the pH of a 0.100 M aqueous solution of NH3. The Kb of NH3 is 1.77 × 10-5.
Respuesta
-
A) 8.95
-
B) 11.12
-
C) 2.88
-
D) 12.12
-
E) 1.87
Pregunta 62
Pregunta
The acid-dissociation constant of hydrocyanic acid (HCN) at 25.0°C is 4.9 × 10-10. What is the pH of an aqueous solution of 0.080 M sodium cyanide (NaCN)?
Respuesta
-
A) 11.11
-
B) 2.89
-
C) 1.3 × 10-3
-
D) 7.8 × 10-12
-
E) 3.9 × 10-11
Pregunta 63
Pregunta
Calculate the pH of 0.586 M anilinium hydrochloride (C6H5NH3Cl) solution in water, given that Kb for aniline is 3.83 × 10-4.
Respuesta
-
A) 1.82
-
B) 12.18
-
C) 5.41
-
D) 8.59
-
E) 12.42
Pregunta 64
Pregunta
A solution of acetic acid is 2.0% dissociated at 25.0°C. What was the original concentration (in M) of the acetic acid solution? The Ka at 25.0 °C for acetic acid is 1.8 × 10-5.
Respuesta
-
A) 3.6 x 10-7
-
B) 0.045
-
C)
-
D)
Pregunta 65
Pregunta
What is the pH of a sodium acetate solution prepared by adding 0.820 grams of sodium acetate to 100.0 ml of water at 25.0°C? The Ka at 25.0°C for acetic acid is 1.8 × 10-5.
Respuesta
-
A) 8.87
-
B) 1.476 x 10-3
-
C) 2.87
-
D) 11.13
Pregunta 66
Pregunta
In the reaction
BF3 + F- → BF4-
BF3 acts as a Br∅nsted-Lowry acid.
Respuesta
-
True
-
False
Pregunta 67
Pregunta
An acid containing the COOH group is called a carbo-oxy acid.
Respuesta
-
True
-
False
Pregunta 68
Pregunta
A Lewis acid is an electron-pair acceptor, and a Lewis base is an electron-pair donor.
Respuesta
-
True
-
False
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