A solution is prepared by dissolving 20.0 g of K2HPO4 and 25.0 g of KH2PO4 in enough water to produce 1.0 L of solution. What is the pH of this buffer? For phosphoric acid (H3PO4), Ka2 = 6.2 *10¯8

A) 7.70 B) 7.42 C) 7.21 D) 7.00 E) 6.72 A) 7.70 B) 7.42 C) 7.21 D) 7.00 E) 6.72

Calculate the solubility of strontium fluoride, SrF2, in pure water. Ksp = 2.6 * 10¯9

A) 1.4 * 10¯3 M B) 3.4 * 10¯4 M C) 8.7 * 10¯4 M D) 5.l *10¯5 M E) 5 M A) 1.4 * 10¯3 M B) 3.4 * 10¯4 M C) 8.7 * 10¯4 M D) 5.l *10¯5 M E) 5 M

The solubility of calcium chromate is 1.56 *10¯3 g/100 mL of solution. What is the Ksp for CaCrO4?

A) 2.4 * 10¯4 B) 1.5 *10¯5 C) 7.6 * 10¯6 D) 1.0 * 10¯8 E) 8 A) 2.4 * 10¯4 B) 1.5 *10¯5 C) 7.6 * 10¯6 D) 1.0 * 10¯8 E) 8

What is the pH of a buffer that consists of 0.45 M CH3COOH and 0.35 M CH3COONa? Ka = 1.8 *10¯5

A) 4.49 B) 4.64 C) 4.85 D) 5.00 E) 5.52 A) 4.49 B) 4.64 C) 4.85 D) 5.00 E) 5.52

What is the [H3O+] in a solution that consists of 1.5 M NH3 and 2.5 NH4Cl? Kb = 1.8 * 10¯5

A) 1.1 * 10¯5 M B) 3.0 * 10¯6 M C) 3.3 * 10¯9 M D) 9.3 * 10¯10 M E) None of these choices is correct. A) 1.1 * 10¯5 M B) 3.0 * 10¯6 M C) 3.3 * 10¯9 M D) 9.3 * 10¯10 M E) None of these choices is correct.

A buffer is to be prepared by adding solid sodium acetate to 0.10 M CH3COOH. Which of the following concentrations of sodium acetate will produce the most effective buffer?

A) 3.0 M CH3COONa B) 2.5 M CH3COONa C) 2.0 M CH3COONa D) 1.5 M CH3COONa E) 0.30 M CH3COONa A) 3.0 M CH3COONa B) 2.5 M CH3COONa C) 2.0 M CH3COONa D) 1.5 M CH3COONa E) 0.30 M CH3COONa

Exam 19: Ionic Equilibria in Aqueous Systems

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You need to use KH₂PO₄ and K₂HPO₄ to prepare a buffer with a pH of 7.45. Which of the following ratios of [base]/[acid] is required? For phosphoric acid, (H₃PO₄), K_a2 = 6.2 *10¯⁸

(Multiple Choice)

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Question 101

Which of the following indicators would be the best to use when 0.050 M benzoic acid (K_a = 6.6*10¯⁵) is titrated with 0.05 M NaOH?

(Multiple Choice)

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Question 102

A solution is prepared by dissolving 20.0 g of K₂HPO₄ and 25.0 g of KH₂PO₄ in enough water to produce 1.0 L of solution. What is the pH of this buffer? For phosphoric acid (H₃PO₄), K_a2 = 6.2 *10¯⁸

(Multiple Choice)

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Question 103

A change in pH will significantly affect the solubility of which, if any, of the following compounds?

(Multiple Choice)

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Question 104

Buffer solutions with the component concentrations shown below were prepared. Which of them should have the lowest pH?

(Multiple Choice)

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Question 105

Calculate the solubility of strontium fluoride, SrF₂, in pure water. K_sp = 2.6 * 10¯⁹

(Multiple Choice)

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Question 106

The solubility of calcium chromate is 1.56 *10¯³ g/100 mL of solution. What is the K_sp for CaCrO₄?

(Multiple Choice)

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Question 107

What is the pH of a buffer that consists of 0.45 M CH₃COOH and 0.35 M CH₃COONa? K_a = 1.8 *10¯⁵

(Multiple Choice)

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Question 108

The salts X(NO₃)₂ and Y(NO₃)₂ (where X⁺ and Y⁺ are metal ions) are dissolved in water to give a solution which is 0.1 M in each of them. Using the K_sp values listed below, decide which aqueous reagent, if any, will definitely precipitate X⁺ before precipitating Y⁺ from solution. Given K_sp values: XCl₂, 1 * 10¯⁵; YCl₂, 1 * 10¯¹⁰; X(OH)₂, 1 10¯¹⁰; Y(OH)₂, 1 10¯⁵

(Multiple Choice)

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Question 109

The equivalence point in a titration is defined as the point when the indicator changes color.

(True/False)

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Question 110

What is the [H₃O⁺] in a solution that consists of 1.5 M NH₃ and 2.5 NH₄Cl? K_b = 1.8 * 10¯⁵

(Multiple Choice)

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Question 111

A formic acid buffer containing 0.50 M HCOOH and 0.50 M HCOONa has a pH of 3.77. What will the pH be after 0.010 mol of NaOH has been added to 100.0 mL of the buffer?

(Multiple Choice)

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Question 112

A buffer is to be prepared by adding solid sodium acetate to 0.10 M CH₃COOH. Which of the following concentrations of sodium acetate will produce the most effective buffer?

(Multiple Choice)

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Question 113

Write the ion product expression for magnesium fluoride, MgF₂.

(Multiple Choice)

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Question 114

When 0.300 g of a diprotic acid was titrated with 0.100 M LiOH, 40.0 mL of the LiOH solution was needed to reach the second equivalence point. Identify the formula of the diprotic acid.

(Multiple Choice)

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Question 115

Showing 101 - 115 of 115

You need to use KH₂PO₄ and K₂HPO₄ to prepare a buffer with a pH of 7.45. Which of the following ratios of [base]/[acid] is required? For phosphoric acid, (H₃PO₄), K_a2 = 6.2 *10¯⁸

Which of the following indicators would be the best to use when 0.050 M benzoic acid (K_a = 6.6*10¯⁵) is titrated with 0.05 M NaOH?

A solution is prepared by dissolving 20.0 g of K₂HPO₄ and 25.0 g of KH₂PO₄ in enough water to produce 1.0 L of solution. What is the pH of this buffer? For phosphoric acid (H₃PO₄), K_a2 = 6.2 *10¯⁸

A change in pH will significantly affect the solubility of which, if any, of the following compounds?

Buffer solutions with the component concentrations shown below were prepared. Which of them should have the lowest pH?

Calculate the solubility of strontium fluoride, SrF₂, in pure water. K_sp = 2.6 * 10¯⁹

The solubility of calcium chromate is 1.56 *10¯³ g/100 mL of solution. What is the K_sp for CaCrO₄?

What is the pH of a buffer that consists of 0.45 M CH₃COOH and 0.35 M CH₃COONa? K_a = 1.8 *10¯⁵

The equivalence point in a titration is defined as the point when the indicator changes color.

What is the [H₃O⁺] in a solution that consists of 1.5 M NH₃ and 2.5 NH₄Cl? K_b = 1.8 * 10¯⁵

A formic acid buffer containing 0.50 M HCOOH and 0.50 M HCOONa has a pH of 3.77. What will the pH be after 0.010 mol of NaOH has been added to 100.0 mL of the buffer?

A buffer is to be prepared by adding solid sodium acetate to 0.10 M CH₃COOH. Which of the following concentrations of sodium acetate will produce the most effective buffer?

Write the ion product expression for magnesium fluoride, MgF₂.

When 0.300 g of a diprotic acid was titrated with 0.100 M LiOH, 40.0 mL of the LiOH solution was needed to reach the second equivalence point. Identify the formula of the diprotic acid.

Keys to the Study of Chemistry

The Components of Matter

Stoichiometry of Formulas and Equations

Three Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids, Solids, and Phase Changes

The Properties of Mixtures: Solutions and Colloids

Periodic Patterns in the Main-Group Elements

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Thermodynamics: Entropy, Free Energy, and the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Elements in Nature and Industry

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

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Exam 19: Ionic Equilibria in Aqueous Systems

You need to use KH2PO4 and K2HPO4 to prepare a buffer with a pH of 7.45. Which of the following ratios of [base]/[acid] is required? For phosphoric acid, (H3PO4), Ka2 = 6.2 *10¯8

Which of the following indicators would be the best to use when 0.050 M benzoic acid (Ka = 6.6*10¯5) is titrated with 0.05 M NaOH?

A solution is prepared by dissolving 20.0 g of K2HPO4 and 25.0 g of KH2PO4 in enough water to produce 1.0 L of solution. What is the pH of this buffer? For phosphoric acid (H3PO4), Ka2 = 6.2 *10¯8

A change in pH will significantly affect the solubility of which, if any, of the following compounds?

Buffer solutions with the component concentrations shown below were prepared. Which of them should have the lowest pH?

Calculate the solubility of strontium fluoride, SrF2, in pure water. Ksp = 2.6 * 10¯9

The solubility of calcium chromate is 1.56 *10¯3 g/100 mL of solution. What is the Ksp for CaCrO4?

What is the pH of a buffer that consists of 0.45 M CH3COOH and 0.35 M CH3COONa? Ka = 1.8 *10¯5

The equivalence point in a titration is defined as the point when the indicator changes color.

What is the [H3O+] in a solution that consists of 1.5 M NH3 and 2.5 NH4Cl? Kb = 1.8 * 10¯5

A formic acid buffer containing 0.50 M HCOOH and 0.50 M HCOONa has a pH of 3.77. What will the pH be after 0.010 mol of NaOH has been added to 100.0 mL of the buffer?

A buffer is to be prepared by adding solid sodium acetate to 0.10 M CH3COOH. Which of the following concentrations of sodium acetate will produce the most effective buffer?

Write the ion product expression for magnesium fluoride, MgF2.

When 0.300 g of a diprotic acid was titrated with 0.100 M LiOH, 40.0 mL of the LiOH solution was needed to reach the second equivalence point. Identify the formula of the diprotic acid.

Keys to the Study of Chemistry

The Components of Matter

Stoichiometry of Formulas and Equations

Three Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids, Solids, and Phase Changes

The Properties of Mixtures: Solutions and Colloids

Periodic Patterns in the Main-Group Elements

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Thermodynamics: Entropy, Free Energy, and the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Elements in Nature and Industry

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

You need to use KH₂PO₄ and K₂HPO₄ to prepare a buffer with a pH of 7.45. Which of the following ratios of [base]/[acid] is required? For phosphoric acid, (H₃PO₄), K_a2 = 6.2 *10¯⁸

Which of the following indicators would be the best to use when 0.050 M benzoic acid (K_a = 6.6*10¯⁵) is titrated with 0.05 M NaOH?

A solution is prepared by dissolving 20.0 g of K₂HPO₄ and 25.0 g of KH₂PO₄ in enough water to produce 1.0 L of solution. What is the pH of this buffer? For phosphoric acid (H₃PO₄), K_a2 = 6.2 *10¯⁸

Calculate the solubility of strontium fluoride, SrF₂, in pure water. K_sp = 2.6 * 10¯⁹

The solubility of calcium chromate is 1.56 *10¯³ g/100 mL of solution. What is the K_sp for CaCrO₄?

What is the pH of a buffer that consists of 0.45 M CH₃COOH and 0.35 M CH₃COONa? K_a = 1.8 *10¯⁵

What is the [H₃O⁺] in a solution that consists of 1.5 M NH₃ and 2.5 NH₄Cl? K_b = 1.8 * 10¯⁵

A buffer is to be prepared by adding solid sodium acetate to 0.10 M CH₃COOH. Which of the following concentrations of sodium acetate will produce the most effective buffer?

Write the ion product expression for magnesium fluoride, MgF₂.