1 / 10

Solubility of Group 2 Hydroxides and Sulfates

Solubility of Group 2 Hydroxides and Sulfates. 2. Know and be able to account for the trends in reactivity with water , the relative solubility of the hydroxides and sulfates. The Trend . Hydroxides increase in solubility down the group. Sulfates decrease in solubility down the group.

flint
Download Presentation

Solubility of Group 2 Hydroxides and Sulfates

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Solubility of Group 2 Hydroxides and Sulfates 2. Know and be able to account for the trends in reactivity with water, the relative solubility of the hydroxides and sulfates

  2. The Trend Hydroxides increase in solubility down the group. Sulfates decrease in solubility down the group.

  3. Factors Affecting Solubility Solubility is dependent on • Lattice Dissociation Energy • Energy of Hydration

  4. Lattice Dissociation Energy • This is the energy required to break the organised structure of the ionic lattice. • Energy is absorbed • ΔH is positive • Lattice Dissociation Energy governed by the distance between the centres of the ions.

  5. Hydration of Ions

  6. Energy of Hydration • Energy is released when an ion is hydrated. • ΔH is negative • Hydration enthalpy is governed by the size of the individual ions. • The force of attraction between small ions and water molecules is greater than large ions

  7. Problem 1 • Calculated values for enthalpy of solution do not match measured values. The situation is complex!

  8. Problem 2 • The is no obvious relationship between enthalpy of solution and solubility.

  9. Problem 3 • The sign of the enthalpy change has no relationship to solubility. • Group 1 carbonates increase in solubility to a point, however barium carbonate is more soluble than strontium carbonate. • Values below are in kJ mol-1

  10. We need to consider entropy Entropy is a measure of the amount of disorder in a system. And that is all I understand for now! 

More Related