Notices
Results 1 to 2 of 2

Thread: decrease in lattice energy and hydration energy means more positive or negative if to explain solubility of group 2 sulphate.

  1. #1 decrease in lattice energy and hydration energy means more positive or negative if to explain solubility of group 2 sulphate. 
    New Member
    Join Date
    Mar 2014
    Posts
    2
    decrease in lattice energy and hydration energy means more positive or negative if to explain solubility of Group2 sulphate?


    Reply With Quote  
     

  2.  
     

  3. #2  
    exchemist
    Join Date
    May 2013
    Location
    London
    Posts
    3,288
    Quote Originally Posted by BenYeohYeelon View Post
    decrease in lattice energy and hydration energy means more positive or negative if to explain solubility of Group2 sulphate?
    There is an explanation of lattice energy here: Lattice energy - Wikipedia, the free encyclopedia

    If you are using the modern convention, the lattice energy should be defined as negative, i.e. the amount by which the lattice has a lower energy (is more stable) than free ions at infinite separation.

    Hydration energy is described here: Hydration energy - Wikipedia, the free encyclopedia

    This actually deals specifically with the issue of whether salts are insoluble or not - though it describes it in rather black and white terms, as if a salt is either "soluble" or "insoluble", whereas in fact of course there is a whole spectrum of solubility in between.

    Suggest an energy level diagram may be helpful, i.e. go in one step from crystal lattice to free ions and in another step hydrate them and see the net energy (enthalpy) change.

    Of course, the position of the equilibrium between dissolved and undissolved salt will be determined not by enthalpy alone, but by Gibbs Free Energy, which takes into account the effects of entropy as well as enthalpy.


    Reply With Quote  
     

Similar Threads

  1. Proof of contents ratio of the universe. Negative energy, Dark matter, Dark energy
    By icarus2 in forum Personal Theories & Alternative Ideas
    Replies: 8
    Last Post: October 22nd, 2013, 05:47 PM
  2. Replies: 4
    Last Post: October 22nd, 2013, 06:05 AM
  3. Dark Energy and Negative Energy
    By Brian Milligan in forum Personal Theories & Alternative Ideas
    Replies: 4
    Last Post: August 9th, 2011, 04:42 AM
  4. Positive energy
    By Charlatan in forum Behavior and Psychology
    Replies: 0
    Last Post: May 18th, 2010, 05:28 AM
  5. does EM energy decrease with red-shifting?
    By gib65 in forum Physics
    Replies: 23
    Last Post: October 30th, 2007, 03:34 PM
Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •