Buffers

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What is a buffer?

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A mixture of a weak acid and it’s conjugate base which can resist changes in the pH when small amounts of acid or base are added

typically contain equal molecular amounts of the acid and it’s conjugate base

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alkaline buffers

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weak base and it’s conjugate acid

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6 Terms

1
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What is a buffer?

A mixture of a weak acid and it’s conjugate base which can resist changes in the pH when small amounts of acid or base are added

typically contain equal molecular amounts of the acid and it’s conjugate base

2
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alkaline buffers

weak base and it’s conjugate acid

3
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Why isn’t it possible to form a buffer solution from a strong acid

  • they will fully ionise in water, so the reaction is not reversible

4
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Buffering capacity

  • the amount of acid or base which can be added to the buffer before the pH will significantly change

  • depends on: the magnitude of the concentration of the acid and it’s conjugate base

  • and how close the two conc are to each other (a buffer conc which is not similar will buffer better in one direction than the other)

5
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Buffers in blood

H2CO3(aq) + H2O(l) →← H3O+ +HCO3-

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what is pH

  • a measure of hydrogen/hydronium ion concentation