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Ionic Equilibria (Buffer Solutions)

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Jhoshna Muniandy

on 11 January 2015

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Transcript of Ionic Equilibria (Buffer Solutions)

Buffer Solutions
What are the components of a Buffer solution?
Acidic Buffer Solutions
Acidic buffer solutions are commonly made from weak acid and one of its salts (or its conjugate base).

Alkaline Buffer Solutions
Alkaline buffer solutions are commonly made from a weak base and one of its salts (or its conjugate acid).

What is a Buffer solution?
So, what is a Buffer solution?
"A buffer solution is a solution that resists any change in pH when small quantities of an acid or a base is added to it."
Definition of a Buffer solution
How do Buffer
Solutions work?
Acidic Buffer Solutions
For example:
Alkaline Buffer Solutions
For example:
What if we add more acid?
The added base in the solution will react with the acetic acid to form acetate ions and water.

In which the position of the equilibrium will move to the right.
What if we add more base?
The position of equilibrium will move to the left, so that the concentration of hydroxide ions can be maintained.

The added base will react with the acid component (ammonium chloride) to form a base component (ammonia) and water.
The buffer solution must remove most of the new hydrogen ions otherwise the pH would drop markedly.

Adding more acid (hydrogen ions) will move the position of equilibrium to the left, and the hydrogen ions that are added will combine with the acetate ions to form acetic acid.
What if we add more base?
What if we add more acid?
Adding more acid will decrease the base component (ammonia). The added acid will combine with the ammonia to form ammonium chloride.
Thank you for your attention!

Buffer Solutions
Daily Life
Blood as a Buffer Solution
The saliva can maintain the pH around 6.8. The saliva contains phosphate buffer solution that can neutralize acids that are formed from the fermentation of food leftovers.
Buffer Solution in Plants
Each plant has a specific pH in order to grow well. Therefore, it is necessary that the pH of the buffer solution can be maintained.
Buffer in Pharmacy
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