Exam 16: Applications of Aqueous Equilibria

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What is the pH upon adding 10 mL of 1.0 M NaOH toa) 1.2 L of water and b) a solution made by the addition of 0.34 mole of Na₂HPO₄ and 0.65 mole of NaH₂PO₄ and sufficient water to give a total volume of 1.2 L?If needed, use the following equation: pH = pK_a + log(A^-/HA)

(Short Answer)

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Question 61

Calculate the pH in the titration of a 0.325 g sample of acetylsalicylic acid (see line drawing below) initially in 25.0 mL water with 0.102 M NaOH when (a) 8.84 mL and (b) 17.68 mL of titrant have been added.

(Short Answer)

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Question 62

A solution is made by the addition of 0.34 mole of Na₂HPO₄ and 0.65 mole of NaH₂PO₄ and sufficient water to give a total volume of 1.2 L. How many grams of NaOH would need to be added to increase the pH by 0.2 pH units?If needed, use the following equation: pH = pK_a + log(A^-/HA)

(Multiple Choice)

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Question 63

At what pH would a solution with a total concentration of 0.20 M phosphate NOT be a buffer? Explain your answer.

(Short Answer)

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Question 64

1.1 mg of HgS (K_sp1.6 x 10^-54) is added to 1.0 L of 0.01 M NaCN ((Hg(CN)₄⁺²), K_f = 4 x 10⁴¹)? What is the value of the reaction quotient for Q_sp and will all of the HgS dissolve?

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Question 65

What mass of ammonium chloride (pK_a (NH₄⁺) = 9.25) must be added to 2.0 L of 0.65 M aqueous ammonia to give a buffer with pH = 8.75?

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Question 66

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What is the pH upon adding 10 mL of 1.0 M NaOH toa) 1.2 L of water and b) a solution made by the addition of 0.34 mole of Na₂HPO₄ and 0.65 mole of NaH₂PO₄ and sufficient water to give a total volume of 1.2 L?If needed, use the following equation: pH = pK_a + log(A^-/HA)

Calculate the pH in the titration of a 0.325 g sample of acetylsalicylic acid (see line drawing below) initially in 25.0 mL water with 0.102 M NaOH when (a) 8.84 mL and (b) 17.68 mL of titrant have been added.

A solution is made by the addition of 0.34 mole of Na₂HPO₄ and 0.65 mole of NaH₂PO₄ and sufficient water to give a total volume of 1.2 L. How many grams of NaOH would need to be added to increase the pH by 0.2 pH units?If needed, use the following equation: pH = pK_a + log(A^-/HA)

At what pH would a solution with a total concentration of 0.20 M phosphate NOT be a buffer? Explain your answer.

1.1 mg of HgS (K_sp1.6 x 10^-54) is added to 1.0 L of 0.01 M NaCN ((Hg(CN)₄⁺²), K_f = 4 x 10⁴¹)? What is the value of the reaction quotient for Q_sp and will all of the HgS dissolve?

What mass of ammonium chloride (pK_a (NH₄⁺) = 9.25) must be added to 2.0 L of 0.65 M aqueous ammonia to give a buffer with pH = 8.75?

Fundamental Concepts of Chemistry

The Behaviour of Gases

Energy and Its Conservation

Atoms and Light

Atomic Energies and Periodicity

Fundamentals of Chemical Bonding

Theories of Chemical Bonding

Effects of Intermolecular Forces

Properties of Solutions

Organic Chemistrystructure

Organic Chemistryreactions

Spontaneity of Chemical Processes

Kinetics: Mechanisms and Rates of Reactions

Principles of Chemical Equilibrium

Aqueous Acidbase Equilibria

Electron Transfer Reactions

Macromolecules

The Transition Metals

The Main Group Elements

Nuclear Chemistry and Radiochemistry

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Exam 16: Applications of Aqueous Equilibria

What is the pH upon adding 10 mL of 1.0 M NaOH toa) 1.2 L of water and b) a solution made by the addition of 0.34 mole of Na2HPO4 and 0.65 mole of NaH2PO4 and sufficient water to give a total volume of 1.2 L?If needed, use the following equation: pH = pKa + log(A-/HA)

Calculate the pH in the titration of a 0.325 g sample of acetylsalicylic acid (see line drawing below) initially in 25.0 mL water with 0.102 M NaOH when (a) 8.84 mL and (b) 17.68 mL of titrant have been added.

A solution is made by the addition of 0.34 mole of Na2HPO4 and 0.65 mole of NaH2PO4 and sufficient water to give a total volume of 1.2 L. How many grams of NaOH would need to be added to increase the pH by 0.2 pH units?If needed, use the following equation: pH = pKa + log(A-/HA)

At what pH would a solution with a total concentration of 0.20 M phosphate NOT be a buffer? Explain your answer.

1.1 mg of HgS (Ksp1.6 x 10-54) is added to 1.0 L of 0.01 M NaCN ((Hg(CN)4+2), Kf = 4 x 1041)? What is the value of the reaction quotient for Qsp and will all of the HgS dissolve?

What mass of ammonium chloride (pKa (NH4+) = 9.25) must be added to 2.0 L of 0.65 M aqueous ammonia to give a buffer with pH = 8.75?

Fundamental Concepts of Chemistry

The Behaviour of Gases

Energy and Its Conservation

Atoms and Light

Atomic Energies and Periodicity

Fundamentals of Chemical Bonding

Theories of Chemical Bonding

Effects of Intermolecular Forces

Properties of Solutions

Organic Chemistrystructure

Organic Chemistryreactions

Spontaneity of Chemical Processes

Kinetics: Mechanisms and Rates of Reactions

Principles of Chemical Equilibrium

Aqueous Acidbase Equilibria

Electron Transfer Reactions

Macromolecules

The Transition Metals

The Main Group Elements

Nuclear Chemistry and Radiochemistry

Filters

What is the pH upon adding 10 mL of 1.0 M NaOH toa) 1.2 L of water and b) a solution made by the addition of 0.34 mole of Na₂HPO₄ and 0.65 mole of NaH₂PO₄ and sufficient water to give a total volume of 1.2 L?If needed, use the following equation: pH = pK_a + log(A^-/HA)

A solution is made by the addition of 0.34 mole of Na₂HPO₄ and 0.65 mole of NaH₂PO₄ and sufficient water to give a total volume of 1.2 L. How many grams of NaOH would need to be added to increase the pH by 0.2 pH units?If needed, use the following equation: pH = pK_a + log(A^-/HA)

1.1 mg of HgS (K_sp1.6 x 10^-54) is added to 1.0 L of 0.01 M NaCN ((Hg(CN)₄⁺²), K_f = 4 x 10⁴¹)? What is the value of the reaction quotient for Q_sp and will all of the HgS dissolve?

What mass of ammonium chloride (pK_a (NH₄⁺) = 9.25) must be added to 2.0 L of 0.65 M aqueous ammonia to give a buffer with pH = 8.75?