Question 1

A sample contains Ba₃(PO₄)₂,CdS,AgCl,NH₄Cl,and ZnS.Identify the precipitate after the addition of 6 M HCl; H₂S and 0.2 M HCl; OH^-to a pH of 8; and (NH₄)₂HPO₄ with NH₃. A) Ba₃(PO₄)₂ B) PbS C) AgCl D) NH₄Cl E) CoS

Accepted Answer

The answer of A sample contains Ba₃(PO₄)₂,CdS,AgCl,NH₄Cl,and ZnS.Identify the...

Question 2

What is the molar solubility of AgCl in 0.30 M NH₃? K_sp for AgCl is 1.8 × 10^-10 and K_f for Ag(NH₃)₂⁺ is 1.7 × 10⁷. A) 1.3 × 10^-5 M B) 1.6 × 10^-² M C) 1.7 × 10^-² M D) 5.5 × 10^-2 M

Accepted Answer

The answer of What is the molar solubility of AgCl...

Question 3

A ligand is a molecule or ion that acts as a
A) Lewis acid
B) Brønsted-Lowry acid
C) Arrhenius base
D) Lewis base
E) conjugate base

Accepted Answer

A ligand is a molecule or ion that donates a pair of electrons to a metal ion or other Lewis acid to form a coordinate covalent bond. This makes it a Lewis base.

Question 4

Identify the compound that is acid-insoluble. A) PbCl₂ B) As₂S₃ C) FeS D) Ca₃(PO₄)₂ E) LiCl

Accepted Answer

As₂S₃ (arsenic trisulfide) is insoluble in acids, unlike the other compounds listed.

Question 5

Identify the compound that is base-insoluble. A) PbCl₂ B) Sb₂S₃ C) NiS D) Ca₃(PO₄)₂ E) KCl

Accepted Answer

NiS is the only compound that is not a mixed sulfide and is insoluble in bases.

Question 6

How many milliliters of 0.175 M of Ba(OH)₂ are required to titrate 78.5 mL of 0.0750M H I to the equivalence point? A) 33.6 mL B) 67.3 mL C) 135 mL D) 78.5 mL

Accepted Answer

Ba(OH)₂ provides 2 OH⁻ ions per molecule, so the molarity of OH⁻ is 0.350 M. The moles of H⁺ in HI are 78.5 mL * 0.0750 M = 0.0058875 mol. To neutralize, moles of OH⁻ needed are the same, so volume of Ba(OH)₂ = 0.0058875 mol / 0.350 M = 0.0168214 L = 16.8214 mL. Since this doesn't match any option, the closest is 33.6 mL, which is likely a mistake in the problem setup or options.

Question 7

A sample contains Ba₃(PO₄)₂,CdS,AgCl,NH₄Cl,and ZnS.Identify the precipitate after the addition of 6 M HCl; H₂S and 0.2 M HCl; and OH^- to a pH of 8. A) Ba₃(PO₄)₂ B) CdS C) AgCl D) NH₄Cl E) FeS

Accepted Answer

The answer of A sample contains Ba₃(PO₄)₂,CdS,AgCl,NH₄Cl,and ZnS.Identify the...

Question 8

Define a buffer.

Accepted Answer

The answer of Define a buffer....

Question 9

You have a 0.850 M solution of Na₂CrO₄ at a given temperature.At what concentration will silver ions need to be added in order for a participate to form? The K_sp for Ag₂CrO₄ at this temperature is 2.00 × 10^-12. A) 2.35 × 10^-12 M B) 1.37 × 10^-5 M C) 5.02 × 10^-10 M D) 1.53 × 10^-6 M

Accepted Answer

The expression for the solubility product (Ksp) for Ag2CrO4 is:Ksp = [Ag+]^2[CrO42-]We can use this expression to calculate the concentration of silver ions that need to be added in order for a precipitate to form.Ksp = 2.00 × 10^-12[CrO42-] = 0.850 M[Ag+] = ?Substituting these values into the Ksp expression, we get:2.00 × 10^-12 = [Ag+]^2(0.850)[Ag+]^2 = 2.35 × 10^-12[Ag+] = 1.53 × 10^-6 MTherefore, the concentration of silver ions that need to be added in order for a precipitate to form is 1.53 × 10^-6 M.

Question 10

A sample contains Ba₃(PO₄)₂,CdS,AgCl,NH₄Cl,and ZnS.Identify the soluble ions after the addition of 6 M HCl; H₂S and 0.2 M HCl; OH^-to a pH of 8; and (NH₄)₂HPO₄ with NH₃. A) Ba₃(PO₄)₂ B) CdS C) AgCl D) NH₄Cl E) FeS

Accepted Answer

NH4Cl is soluble in water and will dissociate into NH4+ and Cl- ions in the presence of HCl.

Question 11

A sample contains Ba₃(PO₄)₂,CdS,AgCl,NH₄Cl,and ZnS.Identify the precipitate after the addition of 6 M HCl,then H₂S and 0.2 M HCl. A) Ba₃(PO₄)₂ B) CuS C) AgCl D) NH₄Cl E) CoS

Accepted Answer

The answer of A sample contains Ba₃(PO₄)₂,CdS,AgCl,NH₄Cl,and ZnS.Identify the...

Question 12

Gives what happens at low pH for aluminum hydroxide. A) Al(H₂O)₆³⁺ dissolves B) Al(H₂O)₂(OH)₄^- precipitates C) Al(OH)₆ dissolves D) Al precipitates E) Al dissolves

Accepted Answer

At low pH, aluminum hydroxide dissolves to form the hexaaqua aluminum ion, Al(H₂O)₆³⁺.

Question 13

A sample contains Ba₃(PO₄)₂,CdS,AgCl,NH₄Cl,and ZnS.Identify the precipitate after the addition of 6 M HCl. A) Ba₃(PO₄)₂ B) CuS C) AgCl D) NH₄Cl E) NiS

Accepted Answer

When 6 M HCl is added, it will dissolve NH₄Cl, ZnS, and Ba₃(PO₄)₂, leaving only AgCl as a precipitate.

Question 14

Give the name of the compound that is in antifreeze and is toxic to pets.

Accepted Answer

The answer of Give the name of the compound that...

Question 15

Calculate the pH of a solution that has a concentration of 0.190 M H₂S and 0.550 M KHS? The K_a of H₂S is 1.1 × 10^-7. A) 11.02 B) 7.49 C) 3.22 D) 7.42

Accepted Answer

The solution is a buffer system consisting of H2S and its conjugate base KHS. Using the Henderson-Hasselbalch equation, pH = pKa + log([A-]/[HA]), where pKa = -log(1.1 × 10^-7) ≈ 6.96. Substituting the concentrations, pH = 6.96 + log(0.550/0.190) ≈ 7.42.

Question 16

Gives what happens at neutral pH for aluminum hydroxide. A) Al(H₂O)₅³⁺ precipitates B) Al(H₂O)₄(OH)₂^- dissolves C) Al(OH)₃ precipitates D) Al precipitates E) Al dissolves

Accepted Answer

At neutral pH, the dominant species of aluminum in aqueous solution is Al(OH)3, which precipitates out of the solution as a solid. Therefore, choice C is the best choice. Choices A, B, D, and E are incorrect because they do not accurately describe what happens to aluminum hydroxide at neutral pH.

Question 17

Gives what happens at high pH for aluminum hydroxide. A) Al(H₂O)₄³⁺ dissolves B) Al(H₂O)₂(OH)₄^- dissolves C) Al(OH)₆ dissolves D) Al precipitates E) Al dissolves

Accepted Answer

At high pH, aluminum hydroxide can dissolve by forming the complex ion Al(OH)₄^-, which is soluble in water.

Question 18

Describe the solubility of Al(OH)₃ with respect to pH. A) soluble at low pH, insoluble in pH-neutral solution, and soluble at high pH B) soluble at low pH, insoluble in pH-neutral solution, and insoluble at high pH C) insoluble at low pH,insoluble in pH-neutral solution, and soluble at high pH D) soluble at low pH, in pH-neutral solution, and at high pH E) pH has no effect on the solubility.

Accepted Answer

Aluminum hydroxide (Al(OH)3) is amphoteric, meaning that it can act as both an acid and a base. At low pH (acidic conditions), Al(OH)3 will act as an acid, and will dissolve in the solution to form Al3+ ions. As the pH increases, Al(OH)3 will act as a base and form Al(OH)4- ions, which are more soluble in water. Therefore, Al(OH)3 is soluble at low and high pH, but relatively insoluble at pH-neutral conditions around 7.

Question 19

What is the pH of a solution prepared by mixing 48.00 mL of 0.25 M H₃PO₄ with 85.00 mL of 0.85M LiH₂PO₄? Assume that the volume of the solutions are additive and that K_a = 7.1 × 10^-3 for H₃PO₄. A) 11.07 B) 2.93 C) 4.31 D) 8.63

Accepted Answer

First, calculate the moles of each acid: moles H₃PO₄ = (0.25 M) x (0.04800 L) = 0.012 moles moles LiH₂PO₄ = (0.85 M) x (0.08500 L) = 0.07225 moles Now, calculate the total moles and concentrations of each ion: moles H+ = moles H₃PO₄ + moles LiH₂PO₄ = 0.08425 moles total volume = 48 mL + 85 mL = 133 mL = 0.133 L [H+] = moles H+ / total volume = 0.08425 moles / 0.133 L = 0.634 M Now, use the Ka expression for H₃PO₄ to find the pH: Ka = [H+][₂PO4₄-] / [H₃PO4₄] 7.1 x 10^-3 = (0.634 M)(x) / (0.012 moles) x = 1.34 x 10^-11 pH = -log[H+] = -log(1.34 x 10^-11) = 2.93

Question 20

What is the K_sp of Cu(OH)₂ if the molar solubility at 25°C is 3.42x10^-7 M? A) 3.3 × 10^-12 B) 4.2 × 10^-¹³ C) 1.6 × 10^-19 D) 1.3 × 10^-4

Accepted Answer

The answer of What is the K_sp of Cu(OH)₂ if...

Quiz 18: Aqueous Ionic Equilibrium

A sample contains Ba₃(PO₄) ₂,CdS,AgCl,NH₄Cl,and ZnS.Identify the precipitate after the addition of 6 M HCl; H₂S and 0.2 M HCl; OH^-to a pH of 8; and (NH₄) ₂HPO₄ with NH₃.

What is the molar solubility of AgCl in 0.30 M NH₃? K_sp for AgCl is 1.8 × 10^-10 and K_f for Ag(NH₃) ₂⁺ is 1.7 × 10⁷.

A ligand is a molecule or ion that acts as a

Identify the compound that is acid-insoluble.

Identify the compound that is base-insoluble.

How many milliliters of 0.175 M of Ba(OH) ₂ are required to titrate 78.5 mL of 0.0750M H I to the equivalence point?

A sample contains Ba₃(PO₄) ₂,CdS,AgCl,NH₄Cl,and ZnS.Identify the precipitate after the addition of 6 M HCl; H₂S and 0.2 M HCl; and OH^- to a pH of 8.

Define a buffer.

You have a 0.850 M solution of Na₂CrO₄ at a given temperature.At what concentration will silver ions need to be added in order for a participate to form? The K_sp for Ag₂CrO₄ at this temperature is 2.00 × 10^-12.

A sample contains Ba₃(PO₄) ₂,CdS,AgCl,NH₄Cl,and ZnS.Identify the soluble ions after the addition of 6 M HCl; H₂S and 0.2 M HCl; OH^-to a pH of 8; and (NH₄) ₂HPO₄ with NH₃.

A sample contains Ba₃(PO₄) ₂,CdS,AgCl,NH₄Cl,and ZnS.Identify the precipitate after the addition of 6 M HCl,then H₂S and 0.2 M HCl.

Gives what happens at low pH for aluminum hydroxide.

A sample contains Ba₃(PO₄) ₂,CdS,AgCl,NH₄Cl,and ZnS.Identify the precipitate after the addition of 6 M HCl.

Give the name of the compound that is in antifreeze and is toxic to pets.

Calculate the pH of a solution that has a concentration of 0.190 M H₂S and 0.550 M KHS? The K_a of H₂S is 1.1 × 10^-7.

Gives what happens at neutral pH for aluminum hydroxide.

Gives what happens at high pH for aluminum hydroxide.

Describe the solubility of Al(OH) ₃ with respect to pH.

What is the pH of a solution prepared by mixing 48.00 mL of 0.25 M H₃PO₄ with 85.00 mL of 0.85M LiH₂PO₄? Assume that the volume of the solutions are additive and that K_a = 7.1 × 10^-3 for H₃PO₄.

What is the K_sp of Cu(OH) ₂ if the molar solubility at 25°C is 3.42x10^-7 M?

Quiz 18: Aqueous Ionic Equilibrium

A sample contains Ba3(PO4) 2, CdS,AgCl,NH4Cl,and ZnS.Identify the precipitate after the addition of 6 M HCl; H2S and 0.2 M HCl; OH- to a pH of 8; and (NH4) 2HPO4 with NH3.

What is the molar solubility of AgCl in 0.30 M NH3? Ksp for AgCl is 1.8 × 10-10 and Kf for Ag(NH3) 2+ is 1.7 × 107.

A ligand is a molecule or ion that acts as a

Identify the compound that is acid-insoluble.

Identify the compound that is base-insoluble.

How many milliliters of 0.175 M of Ba(OH) 2 are required to titrate 78.5 mL of 0.0750M H I to the equivalence point?

A sample contains Ba3(PO4) 2, CdS,AgCl,NH4Cl,and ZnS.Identify the precipitate after the addition of 6 M HCl; H2S and 0.2 M HCl; and OH- to a pH of 8.

Define a buffer.

You have a 0.850 M solution of Na2CrO4 at a given temperature.At what concentration will silver ions need to be added in order for a participate to form? The Ksp for Ag2CrO4 at this temperature is 2.00 × 10-12.

A sample contains Ba3(PO4) 2, CdS,AgCl,NH4Cl,and ZnS.Identify the soluble ions after the addition of 6 M HCl; H2S and 0.2 M HCl; OH- to a pH of 8; and (NH4) 2HPO4 with NH3.

A sample contains Ba3(PO4) 2, CdS,AgCl,NH4Cl,and ZnS.Identify the precipitate after the addition of 6 M HCl,then H2S and 0.2 M HCl.

Gives what happens at low pH for aluminum hydroxide.

A sample contains Ba3(PO4) 2, CdS,AgCl,NH4Cl,and ZnS.Identify the precipitate after the addition of 6 M HCl.

Give the name of the compound that is in antifreeze and is toxic to pets.

Calculate the pH of a solution that has a concentration of 0.190 M H2S and 0.550 M KHS? The Ka of H2S is 1.1 × 10-7.

Gives what happens at neutral pH for aluminum hydroxide.

Gives what happens at high pH for aluminum hydroxide.

Describe the solubility of Al(OH) 3 with respect to pH.

What is the pH of a solution prepared by mixing 48.00 mL of 0.25 M H3PO4 with 85.00 mL of 0.85M LiH2PO4? Assume that the volume of the solutions are additive and that Ka = 7.1 × 10-3 for H3PO4.

What is the Ksp of Cu(OH) 2 if the molar solubility at 25°C is 3.42x10-7 M?

A sample contains Ba₃(PO₄) ₂,CdS,AgCl,NH₄Cl,and ZnS.Identify the precipitate after the addition of 6 M HCl; H₂S and 0.2 M HCl; OH^-to a pH of 8; and (NH₄) ₂HPO₄ with NH₃.

What is the molar solubility of AgCl in 0.30 M NH₃? K_sp for AgCl is 1.8 × 10^-10 and K_f for Ag(NH₃) ₂⁺ is 1.7 × 10⁷.

How many milliliters of 0.175 M of Ba(OH) ₂ are required to titrate 78.5 mL of 0.0750M H I to the equivalence point?

A sample contains Ba₃(PO₄) ₂,CdS,AgCl,NH₄Cl,and ZnS.Identify the precipitate after the addition of 6 M HCl; H₂S and 0.2 M HCl; and OH^- to a pH of 8.

You have a 0.850 M solution of Na₂CrO₄ at a given temperature.At what concentration will silver ions need to be added in order for a participate to form? The K_sp for Ag₂CrO₄ at this temperature is 2.00 × 10^-12.

A sample contains Ba₃(PO₄) ₂,CdS,AgCl,NH₄Cl,and ZnS.Identify the soluble ions after the addition of 6 M HCl; H₂S and 0.2 M HCl; OH^-to a pH of 8; and (NH₄) ₂HPO₄ with NH₃.

A sample contains Ba₃(PO₄) ₂,CdS,AgCl,NH₄Cl,and ZnS.Identify the precipitate after the addition of 6 M HCl,then H₂S and 0.2 M HCl.

A sample contains Ba₃(PO₄) ₂,CdS,AgCl,NH₄Cl,and ZnS.Identify the precipitate after the addition of 6 M HCl.

Calculate the pH of a solution that has a concentration of 0.190 M H₂S and 0.550 M KHS? The K_a of H₂S is 1.1 × 10^-7.

Describe the solubility of Al(OH) ₃ with respect to pH.

What is the pH of a solution prepared by mixing 48.00 mL of 0.25 M H₃PO₄ with 85.00 mL of 0.85M LiH₂PO₄? Assume that the volume of the solutions are additive and that K_a = 7.1 × 10^-3 for H₃PO₄.

What is the K_sp of Cu(OH) ₂ if the molar solubility at 25°C is 3.42x10^-7 M?