Strong Acid, Weak Base, Weak Acid - Equations

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  • Created by: Emily
  • Created on: 09-01-13 19:50
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As strong acids fully dissociate, for example: A weak acid does not fully dissociate, for example: To understand strong bases, firstly need to know the ionic
product of water.
Water when together can react with one of the molecules
This means that the concentration of the acid can be said acting as an acid (donation of a H+). This causes a
to be the concentration of the H+ ions. So overall [H+] = formation of a hydroxonium ion and a hydroxide ion.
This means an acid dissociation constant is created as
This means to work out the pH the following equation can equilibrium is present it measures the extent to which the
be used. acid dissociation occurs. Expressed like this: This can simplify to:
The equilibrium constant can be expressed as:
And at 25o the ionic product of water is 1.00 x 1014 mol2
This can then be rearranged to get the [H+] and can this dm6
information can then be used to work out the pH.
Strong base completely dissociates:
Therefore the [OH] = [Alkali]
As well as this a measurement similar to pH can be used
called pKa. To work out pH the Kw equation can be rearranged and
then put into the pH equation.
The lower the value of pKa = the stronger the acid
The higher the value of pKa = weaker the acid


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