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Exam 15: Applications of Aqueous Equilibria

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Question 51

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What is the pH at the equivalence point of a weak base-strong acid titration if 20.00 mL of NaOCl requires 28.30 mL of 0.50 M HCl? K_a = 3.0 × 10^-8 for HOCl.

A) 0) 30
B) 3) 18
C) 3) 76
D) 4) 03

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Question 52

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Calculate the K_sp for silver sulfite if the solubility of Ag₂SO₃ in pure water is 4.6 × 10^-3 g/L.

A) 3) 8 × 10^-15
B) 1) 5 × 10^-14
C) 2) 4 × 10^-10
D) 4) 8 × 10^-10

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Question 53

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The following plot shows two titration curves,each representing the titration of 50.00 mL of 0.100 M acid with 0.100 M NaOH. -Which points a-d represent the half-equivalence point and the equivalence point,respectively,for the titration of a weak acid?

What is the K_a of the amino acid glycine if it is 75.0% dissociated at pH = 10.08?

Calculate the molar solubility of thallium(I) chloride in 0.40 M NaCl at 25°C.K_sp for TlCl is 1) 7 × 10^-4.

Which is a net ionic equation for the neutralization reaction of a weak acid with a weak base?

The following pictures represent solutions that contain a weak acid HA (pK_a = 5.0) and its potassium salt KA.Unshaded spheres represent H atoms and shaded spheres represent A^- ions.(K⁺,H₃O⁺,OH^-,and solvent H₂O molecules have been omitted for clarity. ) -Which solution has the greatest buffer capacity?

Which of these neutralization reactions has a pH < 7 when equal molar amounts of acid and base are mixed?

What is the [CH₃CO₂^-]/[CH₃CO₂H] ratio necessary to make a buffer solution with a pH of 4.44? K_a = 1.8 × 10^-5 for CH₃CO₂H.

What is the pH of the solution formed when 50 mL of 0.250 M NaOH is added to 50 mL of 0.120 M HCl?

When 50 mL of 0.10 M NaF is added to 50 mL of 0.10 M HF,relative to the pH of the 0.10 M HF solution the pH of the resulting solution will

The following pictures represent solutions that contain a weak acid HA and/or its potassium salt KA.Unshaded spheres represent H atoms and shaded spheres represent A^- ions.(K⁺,H₃O⁺,OH^-,and solvent H₂O molecules have been omitted for clarity. ) -Which of the solutions are buffer solutions?

What is the pH of a buffer solution made by mixing 50.0 mL of 0.100 M potassium hydrogen phthalate with 13.6 mL of 0.100 M NaOH and diluting the mixture to 100.0 mL with water? The K_a2 for hydrogen phthalate is 3.1 × 10^-6.

What is the Henderson-Hasselbalch equation for the acidic buffer HA/A^-?

What is the pH of a solution made by mixing 10.00 mL of 0.10 M acetic acid with 10.00 mL of 0.10 M KOH? Assume that the volumes of the solutions are additive.K_a =1.8 × 10^-5 for CH₃CO₂H.

The following pictures represent solutions that contain a weak acid HA and/or its potassium salt KA.Unshaded spheres represent H atoms and shaded spheres represent A^- ions.(K⁺,H₃O⁺,OH^-,and solvent H₂O molecules have been omitted for clarity. ) -Which solution has the highest pH?

A solution may contain the following ions Ag⁺,Cu²⁺,Cd²⁺,Mn²⁺,Ni²⁺ and Na⁺.A white precipitate formed when 0.10 M NaCl was added and after this was removed the solution was treated with H₂S gas under acidic conditions and no precipitate formed.When the solution was made basic and again treated with H₂S gas a dark colored precipitate formed.If no further tests were made then what conclusions can you draw?

The following pictures represent solutions at various stages in the titration of a weak diprotic acid H₂A with aqueous KOH.Unshaded spheres represent H atoms,black spheres represent oxygen atoms,and shaded spheres represent A^2- ions.(K⁺,H₃O⁺ initially present,OH^- initially present and solvent water molecules have been omitted for clarity) . -Which picture represents the system halfway between the first and second equivalence points?

TRIS {(HOCH₂) ₃CNH₂} is one of the most common buffers used in biochemistry.A solution is prepared by adding enough TRIS and 12 M HCl(aq) to give 1.00 L of solution with [TRIS] = 0.30 M and [TRISH⁺] = 0.60 M.What is the pH of this buffered system if the pK_b is 5.92?

The following pictures represent solutions of AgCl,which may also contain ions other than Ag⁺ and Cl^- which are not shown.Gray spheres represent Ag⁺ ions and dotted spheres represent Cl^- ions. -If solution (1) is a saturated solution of AgCl,which of solutions (1) -(4) represents the solution after a small amount of NH₃ is added and equilibrium is restored?