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Understanding Buffers and their Role in Maintaining pH with Salts - Prof. Lisa Dysleski, Study notes of Chemistry

Colorado State University (CSU)Chemistry
Prof. Lisa Dysleski

An overview of buffers, their importance in maintaining ph levels, and the role of salts in the process. Buffers are essential in biological systems due to their ability to neutralize added acids or bases, and consist of a weak acid and its conjugate base. How high concentrations of the weak acid and its conjugate base, around 0.1 m or more, help in producing small changes in ph. The common ion effect is also discussed, which suppresses the dissociation of the weak acid when the common ion is present in the solution. If the buffer components have the same concentration, the pka and ph are equal.

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2010/2011

Uploaded on 11/15/2011

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mardiguian26149 🇺🇸

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23 March
Exam covers through 19.1
Salts are ionic, will dissociate
Buffers work because
Essential components: weak acid and its conjugate base
High concentrations of HA and A-
Around 0.1 M or more
Added acid or base is neutralized by buffer component
Produces small change in buffer component concentration ratio, therefore small change
in pH
Must contain weak acid and its conjugate base
Otherwise acid and base would just react with each other
The common ion effect
Having A- present in solution (known as the common ion) suppresses the dissociation of HA and
also drastic shifts in equilibrium
If buffer components are the same concentration, pKa = pH

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23 March Exam covers through 19. Salts are ionic, will dissociate Buffers work because Essential components: weak acid and its conjugate base High concentrations of HA and A- Around 0.1 M or more Added acid or base is neutralized by buffer component Produces small change in buffer component concentration ratio, therefore small change in pH Must contain weak acid and its conjugate base Otherwise acid and base would just react with each other The common ion effect Having A-^ present in solution (known as the common ion) suppresses the dissociation of HA and also drastic shifts in equilibrium If buffer components are the same concentration, pKa = pH