Chapter 15/14?- Additional aspects of aqueous equilibria

Frage 1 von 45

1

Which one of the following pairs cannot be mixed together to form a buffer solution?

Wähle eine der folgenden:

A) HONH2, HONH3Cl
B) NaCl, HCl
C) RbOH, HF
D) KOH, HNO2
E) H2SO3, KHSO3

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Frage 2 von 45

1

Which one of the following pairs cannot be mixed together to form a buffer solution?

Wähle eine der folgenden:

A) NH3, NH4Cl
B) NaC2H3O2, HCl (C2H3O2- = acetate)
C) RbOH, HBr
D) KOH, HF
E) H3PO4, KH2PO4

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Frage 3 von 45

1

A solution containing which one of the following pairs of substances will be a buffer solution?

Wähle eine der folgenden:

A) NaI, HI
B) KBr, HBr
C) RbCl, HCl
D) CsF, HF
E) none of the above

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Frage 4 von 45

1

What change will be caused by addition of a small amount of HCl to a solution containing fluoride ions and hydrogen fluoride?

Wähle eine der folgenden:

A) The concentration of hydronium ions will increase significantly.
B) The concentration of fluoride ions will increase as will the concentration of hydronium ions.
C) The concentration of hydrogen fluoride will decrease and the concentration of fluoride ions will increase.
D) The concentration of fluoride ion will decrease and the concentration of hydrogen fluoride will increase.
E) The fluoride ions will precipitate out of solution as its acid salt.

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Frage 5 von 45

1

In a solution, when the concentrations of a weak acid and its conjugate base are equal,

Wähle eine der folgenden:

A) the system is not at equilibrium.
B) the buffering capacity is significantly decreased.
C) the -log of the [H+] and the -log of the Ka are equal.
D) all of the above are true.

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Frage 6 von 45

1

Of the following solutions, which has the greatest buffering capacity?

Wähle eine der folgenden:

A) 0.521 M HC2H3O2 and 0.217 M NaC2H3O2
B) 0.821 M HC2H3O2 and 0.713 M NaC2H3O2
C) 0.365M HC2H3O2 and 0.497 M NaC2H3O2
D) 0.121 M HC2H3O2 and 0.116 M NaC2H3O2

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Frage 7 von 45

1

) Of the following solutions, which has the greatest buffering capacity?

Wähle eine der folgenden:

A) 0.543 M NH3 and 0.555 M NH4Cl
B) 0.087 M NH3 and 0.088 M NH4Cl
C) 0.234 M NH3 and 0.100 M NH4Cl
D) 0.100 M NH3 and 0.455 M NH4Cl
E) They are all buffer solutions and would all have the same capacity.

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Frage 8 von 45

1

The addition of hydrofluoric acid and __________ to water produces a buffer solution.

Wähle eine der folgenden:

A) HCl
B) NaNO3
C) NaF
D) NaCl
E) NaBr

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Frage 9 von 45

1

The addition of sodium hydroxide and __________ to water produces a buffer solution.

Wähle eine der folgenden:

A) HCl
B) NaC2H3O2
C) NaF
D) NH3
E) none of the above

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Frage 10 von 45

1

Which of the following could be added to a solution of potassium fluoride to prepare a buffer?

Wähle eine der folgenden:

A) sodium hydroxide
B) potassium acetate
C) hydrochloric acid
D) sodium fluoride
E) ammonia

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Frage 11 von 45

1

A 25.0 mL sample of a solution of an unknown compound is titrated with a 0.115 M NaOH solution. The titration curve above was obtained. The unknown compound is __________.

Wähle eine der folgenden:

A) a strong acid
B) a strong base
C) a weak acid
D) a weak base

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Frage 12 von 45

1

A 25.0 mL sample of a solution of a monoprotic acid is titrated with a 0.115 M NaOH solution. The titration curve above was obtained. The concentration of the monoprotic acid is about __________ mol/L.

Wähle eine der folgenden:

A) 25.0
B) 0.0600
C) 0.240
D) 0.120
E) 0.100

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Frage 13 von 45

1

A 25.0 mL sample of a solution of a monoprotic acid is titrated with a 0.115 M NaOH solution. The titration curve above was obtained. Which of the following indicators would be best for this titration?

Wähle eine der folgenden:

A) methyl red
B) bromthymol blue
C) thymol blue
D) phenolpthalein
E) bromocresol purple

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Frage 14 von 45

1

Which compound listed below has the greatest molar solubility in water?

Wähle eine der folgenden:

A) CdCO3
B) Cd(OH)2
C) AgI
D) CaF2
E) ZnCO3

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Frage 15 von 45

1

The molar solubility of __________ is not affected by the pH of the solution.

Wähle eine der folgenden:

A) Na3PO4
B) NaF
C) KNO3
D) ACl3
E) MnS

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Frage 16 von 45

1

In which of the following aqueous solutions would you expect AgCl to have the lowest solubility?

Wähle eine der folgenden:

A) pure water
B) 0.020 M BaCl2
C) 0.015 NaCl
D) 0.020 AgNO3
E) 0.020 KCl

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Frage 17 von 45

1

In which one of the following solutions is silver chloride the most soluble?

Wähle eine der folgenden:

A) 0.181 M HCl
B) 0.0176 M NH3
C) 0.744 M LiNO3
D) pure water
E) 0.181 M NaCl

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Frage 18 von 45

1

Which below best describe(s) the behavior of an amphoteric hydroxide in water?

Wähle eine der folgenden:

A) With conc. aq. NaOH, its suspension dissolves.
B) With conc. aq. HCl, its suspension dissolves.
C) With conc. aq. NaOH, its clear solution forms a precipitate.
D) With conc. aq. HCl, its clear solution forms a precipitate.
E) With both conc. aq. NaOH and conc. aq. HCl, its suspension dissolves.

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Frage 19 von 45

1

A result of the common-ion effect is __________.

Wähle eine der folgenden:

A) that some ions, such as Na+ (aq), frequently appear in solutions but do not participate in solubility equilibria
B) that common ions, such as Na+ (aq), don't affect equilibrium constants
C) that the selective precipitation of a metal ion, such as Ag+, is promoted by the addition of an appropriate counterion (X-) that produces a compound (AgX) with a very low solubility
D) that ions such as K+ and Na+ are common ions, so that their values in equilibrium constant expressions are always 1.00
E) that common ions precipitate all counter-ions

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Frage 20 von 45

1

The Ka of benzoic acid is 6.30 × 10-5. The pH of a buffer prepared by combining 50.0 mL of 1.00 M potassium benzoate and 50.0 mL of 1.00 M benzoic acid is __________.

Wähle eine der folgenden:

A) 1.705
B) 0.851
C) 3.406
D) 4.201
E) 2.383

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Frage 21 von 45

1

Calculate the pH of a solution prepared by dissolving 0.150 mol of acetic acid and 0.300 mol of sodium acetate in water sufficient to yield 1.00 L of solution. The Ka of acetic acid is 1.76 × 10-5.

Wähle eine der folgenden:

A) 2.516
B) 3.892
C) 4.502
D) 10.158
E) 5.056

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Frage 22 von 45

1

The pH of a solution prepared by dissolving 0.350 mol of solid methylamine hydrochloride (CH3NH3Cl) in 1.00 L of 1.10 M methylamine (CH3NH2) is __________. The Kb for methylamine is 4.40 × 10-4. (Assume the final volume is 1.00 L.)

Wähle eine der folgenden:

A) 1.66
B) 2.86
C) 10.28
D) 11.14
E) 10.61

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Frage 23 von 45

1

A 25.0 mL sample of 0.723 M HClO4 is titrated with a 0.27 M KOH solution. The H3O+ concentration after the addition of 80.0 mL of KOH is __________ M.

Wähle eine der folgenden:

A) 0.0333
B) 1 × 10-7
C) 0.7
D) 3 × 10-13
E) 4 × 10-2

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Frage 24 von 45

1

The pH of a solution prepared by mixing 50.0 mL of 0.125 M KOH and 50.0 mL of 0.125 M HCl is __________.

Wähle eine der folgenden:

A) 6.29
B) 7.00
C) 8.11
D) 5.78
E) 0.00

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Frage 25 von 45

1

The pH of a solution prepared by mixing 40.0 mL of 0.125 M Mg(OH)2 and 150.0 mL of 0.125 M HCl is __________.

Wähle eine der folgenden:

A) 6.29
B) 4.11
C) 1.14
D) 5.78
E) 1.34

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Frage 26 von 45

1

The pH of a solution prepared by mixing 50.0 mL of 0.125 M NaOH and 40.0 mL of 0.125 M HNO3 is __________.

Wähle eine der folgenden:

A) 13.29
B) 7.00
C) 8.11
D) 11.00
E) none of the above

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Frage 27 von 45

1

A 50.0 mL sample of an aqueous H2SO4 solution is titrated with a 0.375 M NaOH solution. The equivalence point is reached with 62.5 mL of the base. The concentration of H2SO4 is __________ M.

Wähle eine der folgenden:

A) 0.234
B) 0.469
C) 0.150
D) 0.300
E) 0.938

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Frage 28 von 45

1

The concentration of iodide ions in a saturated solution of lead (II) iodide is __________ M. The solubility product constant of PbI2 is 1.4 × 10-8.

Wähle eine der folgenden:

A) 3.8 × 10-4
B) 3.0 × 10-3
C) 1.5 × 10-3
D) 3.5 × 10-9
E) 1.4 × 10-8

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Frage 29 von 45

1

Calculate the percent ionization of formic acid (HCO2H) in a solution that is 0.311 M in formic acid and 0.189 M in sodium formate (NaHCO2). The Ka of formic acid is 1.77 × 10-4.

Wähle eine der folgenden:

A) 37.8
B) 0.0937
C) 11.3
D) 1.06 × 10-3
E) 3.529

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Frage 30 von 45

1

A solution is prepared by dissolving 0.23 mol of hydrofluoric acid and 0.27 mol of sodium fluoride in water sufficient to yield 1.00 L of solution. The addition of 0.05 mol of HCl to this buffer solution causes the pH to drop slightly. The pH does not decrease drastically because the HCl reacts with the __________ present in the buffer solution. The Ka of hydrofluoric acid is 1.36 × 10-3.

Wähle eine der folgenden:

A) H2O
B) H3O+
C) fluoride ion
D) hydrofluoric acid
E) This is a buffer solution: the pH does not change upon addition of acid or base.

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Frage 31 von 45

1

A solution is prepared by dissolving 0.23 mol of hydrazoic acid and 0.27 mol of sodium azide in water sufficient to yield 1.00 L of solution. The addition of 0.05 mol of NaOH to this buffer solution causes the pH to increase slightly. The pH does not increase drastically because the NaOH reacts with the __________ present in the buffer solution. The Ka of hydrazoic acid is 1.9 × 10-5.

Wähle eine der folgenden:

A) H2O
B) H3O+
C) azide
D) hydrazoic acid
E) This is a buffer solution: the pH does not change upon addition of acid or base.

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Frage 32 von 45

1

Consider a solution containing 0.100 M fluoride ions and 0.126 M hydrogen fluoride. The concentration of fluoride ions after the addition of 4.00 mL of 0.0100 M HCl to 25.0 mL of this solution is __________ M.

Wähle eine der folgenden:

A) 0.0862
B) 0.0876
C) 0.0980
D) 0.0848
E) 0.00253

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Frage 33 von 45

1

The Ka of acetic acid is 1.76 × 10-5. The pH of a buffer prepared by combining 45.0 mL of 1.00 M potassium acetate and 50.0 mL of 1.00 M acetic acid is __________.

Wähle eine der folgenden:

A) 1.705
B) 0.851
C) 3.406
D) 4.709
E) 2.383

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Frage 34 von 45

1

The Kb of ammonia is 1.76 × 10-5. The pH of a buffer prepared by combining 50.0 mL of 1.00 M ammonia and 50.0 mL of 1.00 M ammonium nitrate is __________.

Wähle eine der folgenden:

A) 4.632
B) 9.246
C) 4.742
D) 9.372
E) none of the above

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Frage 35 von 45

1

How many milliliters of 0.0850 M NaOH are required to titrate 25.0 mL of 0.0720 M HBr to the equivalence point?

Wähle eine der folgenden:

A) 21.2
B) 0.245
C) 3.92
D) 0.153
E) 29.5

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Frage 36 von 45

1

A 25.0 mL sample of 0.150 M hydrazoic acid is titrated with a 0.150 M NaOH solution. What is the pH at the equivalence point? The Ka of hydrazoic acid is 4.50 × 10-4.

Wähle eine der folgenden:

A) 11.72
B) 9.28
C) 4.72
D) 7.00
E) 8.80

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Frage 37 von 45

1

A 25.0-mL sample of 0.150 M butanoic acid is titrated with a 0.150 M NaOH solution. What is the pH before any base is added? The Ka of butanoic acid is 1.5 × 10-5.

Wähle eine der folgenden:

A) 2.83
B) 1.5 × 10-3
C) 4.82
D) 4.00
E) 1.0 × 104

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Frage 38 von 45

1

A 25.0 mL sample of 0.150 M hypochlorous acid is titrated with a 0.150 M NaOH solution. What is the pH after 26.0 mL of base is added? The Ka of hypochlorous acid is 3.0 × 10-8.

Wähle eine der folgenden:

A) 2.54
B) 11.47
C) 7.00
D) 7.51
E) 7.54

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Frage 39 von 45

1

A 25.0-mL sample of 0.150 M hydrazoic acid is titrated with a 0.150 M NaOH solution. What is the pH after 13.3 mL of base is added? The Ka of hydrazoic acid is 1.9 × 10-5.

Wähle eine der folgenden:

A) 4.45
B) 1.34
C) 3.03
D) 4.78
E) 4.66

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Frage 40 von 45

1

A 25.0 mL sample of 0.723 M HClO4 is titrated with a 0.273 M KOH solution. The H3O+ concentration after the addition of 60.0 mL of KOH is __________ M.

Wähle eine der folgenden:

A) 0.0181
B) 0.430
C) 0.0200
D) 0.273
E) none of the above

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Frage 41 von 45

1

The pH of a solution prepared by mixing 45.0 mL of 0.183 M KOH and 25.0 mL of 0.145 M HCl is __________.

Wähle eine der folgenden:

A) 1.314
B) 1.181
C) 0.00824
D) 12.819
E) 12.923

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Frage 42 von 45

1

In which aqueous system is Pbl2 least soluble?

Wähle eine der folgenden:

A) H2O
B) 0.5 M HI
C) 0.2 M HI
D) 1.0 M HNO3
E) 0.8 M KI

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Frage 43 von 45

1

Suppose you have just added 100.0 ml of a solution containing 0.5000 moles of acetic acid per liter to 400.0 ml of 0.5000 M NaOH. What is the final pH? The Ka of acetic acid is 1.77 × 10-5.

Wähle eine der folgenden:

A) 9.123
B) 4.877
C) 0.5229
D) 13.48

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Frage 44 von 45

1

An assembly of a metal ion and the Lewis bases bonded to it is called a __________.

Wähle eine der folgenden:

A) Complex Ion
B) Lewis Structure
C) Soluble compound

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Frage 45 von 45

1

Metal oxides and hydroxides that are relatively insoluble in neutral water, but are soluble in both strongly acidic and strongly basic solutions are said to be __________.

Wähle eine der folgenden:

A) amphiprotic
B) amphoteric
C) amphiphilic
D) amphipathic

	Erstellt von Dawn G vor fast 10 Jahre

Originally chapter 17

Chapter 15/14?- Additional aspects of aqueous equilibria

Chapter 15/14?- Additional aspects of aqueous equilibria

Frage 1 von 45

Which one of the following pairs cannot be mixed together to form a buffer solution?

Wähle eine der folgenden:

Erklärung

Frage 2 von 45

Which one of the following pairs cannot be mixed together to form a buffer solution?

Wähle eine der folgenden:

Erklärung

Frage 3 von 45

A solution containing which one of the following pairs of substances will be a buffer solution?

Wähle eine der folgenden:

Erklärung

Frage 4 von 45

What change will be caused by addition of a small amount of HCl to a solution containing fluoride ions and hydrogen fluoride?

Wähle eine der folgenden:

Erklärung

Frage 5 von 45

In a solution, when the concentrations of a weak acid and its conjugate base are equal,

Wähle eine der folgenden:

Erklärung

Frage 6 von 45

Of the following solutions, which has the greatest buffering capacity?

Wähle eine der folgenden:

Erklärung

Frage 7 von 45

) Of the following solutions, which has the greatest buffering capacity?

Wähle eine der folgenden:

Erklärung

Frage 8 von 45

The addition of hydrofluoric acid and __________ to water produces a buffer solution.

Wähle eine der folgenden:

Erklärung

Frage 9 von 45

The addition of sodium hydroxide and __________ to water produces a buffer solution.

Wähle eine der folgenden:

Erklärung

Frage 10 von 45

Which of the following could be added to a solution of potassium fluoride to prepare a buffer?

Wähle eine der folgenden:

Erklärung

Frage 11 von 45

A 25.0 mL sample of a solution of an unknown compound is titrated with a 0.115 M NaOH solution. The titration curve above was obtained. The unknown compound is __________.

Wähle eine der folgenden:

Erklärung

Frage 12 von 45

A 25.0 mL sample of a solution of a monoprotic acid is titrated with a 0.115 M NaOH solution. The titration curve above was obtained. The concentration of the monoprotic acid is about __________ mol/L.

Wähle eine der folgenden:

Erklärung

Frage 13 von 45

A 25.0 mL sample of a solution of a monoprotic acid is titrated with a 0.115 M NaOH solution. The titration curve above was obtained. Which of the following indicators would be best for this titration?

Wähle eine der folgenden:

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Frage 14 von 45

Which compound listed below has the greatest molar solubility in water?

Wähle eine der folgenden:

Erklärung

Frage 15 von 45

The molar solubility of __________ is not affected by the pH of the solution.

Wähle eine der folgenden:

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Frage 16 von 45

In which of the following aqueous solutions would you expect AgCl to have the lowest solubility?

Wähle eine der folgenden:

Erklärung

Frage 17 von 45

In which one of the following solutions is silver chloride the most soluble?

Wähle eine der folgenden:

Erklärung

Frage 18 von 45

Which below best describe(s) the behavior of an amphoteric hydroxide in water?

Wähle eine der folgenden:

Erklärung

Frage 19 von 45

A result of the common-ion effect is __________.

Wähle eine der folgenden:

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Frage 20 von 45