Solubility Concepts and Ksp Calculation Quiz

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Questions and Answers

What is the equilibrium constant expression for the reaction between Ca2+ and 2F-?

  • [Ca2+][F-]^2
  • [Ca2+][F-] (correct)
  • [Ca2+]^2[F-]
  • [Ca2+]/[F-]

In the solubility calculations of CaF2, what is the Ksp value at 25 °C?

  • 4.0x10-11 (correct)
  • 5.0x10-11
  • 3.0x10-11
  • 6.0x10-11

For the reaction of Ag+ and Br-, what is the balanced equilibrium equation?

  • Ag+ -> AgBr + Br-
  • AgBr -> Ag+ + Br-
  • Ag+ + Br- -> AgBr (correct)
  • Br- -> Ag+ + AgBr

What does the Ksp value represent in a solubility product constant expression?

<p>Product of ion concentrations at equilibrium (D)</p> Signup and view all the answers

What is the solubility of AgBr calculated to be in the sample problem at 25 °C?

<p>7.07 x 10^-7 M (B)</p> Signup and view all the answers

What table is used in solubility calculations to track initial, change, and equilibrium values?

<p>ICE (Initial, Change, Equilibrium) table (C)</p> Signup and view all the answers

Calculate the solubility of PbSO4 if the Ksp value is 1.8x10-8.

<p>4.2x10-7 M (B)</p> Signup and view all the answers

What is the solubility of FeCO3 with a Ksp value of 3.5x10-12?

<p>2.6x10-5 M (B)</p> Signup and view all the answers

Determine the solubility of Ag+ and SO42- if the Ksp value is 1.8x10-10.

<p>1.4x10-9 M (B)</p> Signup and view all the answers

What is the solubility of CaF2 given a Ksp value of 1.6x10-9?

<p>8.0x10-5 M (A)</p> Signup and view all the answers

Compute the solubility of Ca3(PO4)2 if the Ksp value is 2.5x10-27.

<p>1.25x10-18 M (B)</p> Signup and view all the answers

What is the equilibrium constant expression, Ksp, for the reaction involving barium sulfate?

<p>Ksp = [Ba2+][SO4 2-] (C)</p> Signup and view all the answers

If the concentration of barium ions in a solution of barium sulfate is 2.0 x 10^-5 M, what is the concentration of sulfate ions?

<p>1.0 x 10^-5 M (A)</p> Signup and view all the answers

In the context of solubility equilibria, what does it mean if a compound is described as 'practically insoluble'?

<p>It forms a precipitate in water (D)</p> Signup and view all the answers

Which of the following statements best describes the technique of gravimetric analysis in relation to insoluble compounds?

<p>It relies on measuring the weight of pure precipitates (C)</p> Signup and view all the answers

What is the significance of the equilibrium constant, Kf, in the context of complexation equilibria?

<p>It quantifies the stability of the complex formed (D)</p> Signup and view all the answers

If a compound has a high solubility product constant (Ksp) value, what can be inferred about its solubility?

<p>It is highly soluble in water (C)</p> Signup and view all the answers

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Study Notes

Solubility Equilibrium

  • Solubility is the equilibrium amount of solute that dissolves in a given amount of solvent at a given temperature and pressure.
  • Solubility can be mathematically expressed using the solubility product constant (Ksp).

Ksp Expression

  • The Ksp expression is written as: Ksp = [A+] [B-]^n, where [A+] is the concentration of the cation and [B-]^n is the concentration of the anion raised to the power of its stoichiometric coefficient.

Calculations Involving Solubility Equilibria

  • To compute the solubility of a reaction, follow these steps:
    • Write the balanced equilibrium reaction.
    • Write the Ksp expression.
    • Make an ICE (Initial, Change, and Equilibrium) table.
    • Substitute the values into the Ksp equation and solve for x.

Sample Problems

  • Compute the solubility of the reaction of Ag+ and Br-: Ksp = 5.0x10^-13, x = 7.07 x10^-7 M.
  • Compute the solubility of the reaction of Ca2+ and F-: Ksp = 4.0x10^-11, x = 2.15 x10^-4 M.

Assessment Task

  • Enumerate and describe the different concepts in solubility.
  • Write the solubility product expression for PbSO4, Ca3(PO4)2, and Fe(OH)3.
  • Compute the solubility of the reaction of PbCl2, Fe2+ and CO32-, and Ca2+ and F-.
  • Compute the solubility of the reaction of Ag+ and SO42-.

Complexation Equilibria

  • The reaction between an acceptor metal ion M and a ligand L is characterized by an equilibrium constant (Kf).
  • Example: The copper-EDTA complex at 25°C: Kf = 6.3 x 10^18.

Solubility Equilibria in Analysis

  • Solubility equilibria can be used analytically to separate and determine the concentration of insoluble compounds.
  • Example: Gravimetric analysis of sulfate ions using barium chloride (BaCl2).
  • The solubility product (Ksp) is an equilibrium constant for the reaction: BaSO4 (s) = Ba2+ + SO4 2-.

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