Water Dissociation

  • Thread starter Kyoma
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  • #1
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Pure water is made up of water molecules, no free moving ions. However, if you add an ionic compound, say copper sulfate into water, Cu2+ and SO42- will be produced, so will H+ and OH- ions.

Why will water molecules dissociate into hydrogen and hydroxide ions when an ionic compound is added? Why will the ionic compounds dissociate in water?
 

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  • #2
Borek
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Pure water is made up of water molecules, no free moving ions. However, if you add an ionic compound, say copper sulfate into water, Cu2+ and SO42- will be produced, so will H+ and OH- ions.
That's incorrect, see water autodissociation.
 
  • #3
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o_O

Then why will some ionic compounds (or covalent compounds) dissociate only in the presence of water? What makes water so special?
 
  • #4
Borek
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High dipole moment and high dielectric constant, ions are solvated which to some extent neutralizes their charges and makes separation easier.
 
  • #5
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Hi,

As we know that in the electrolysis of water we get oxygen and hydrogen, but how, water dissosites as H+ and HO- , so H+ would go to the cathode and become H2(gas) but what would become of the OH- ion? how it will become O2?.
 

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