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CHEM 1114 (9)
Lecture

buffers.docx

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Department
Chemistry
Course
CHEM 1114
Professor
K.Sveinson
Semester
Fall

Description
Buffers Buffer : a solution containing a weak acid and its conjugate base in equilibrium (or a weak base and its conjugate acid in equilibrium) Both components of the situation are in appreciable quantities (> 1.0 M) Note: acid and conjugate bases do not have to have the same concentration, but close Ex. Consider a 1M CH COOH3buffer solution - + CH 3OOH  CH COO + H 3 K as equal to products / reactants therefore : + K a [CH C3OH] [H ] CH C3OH Since CH C3OH = CH COO ,3they can cancel out leaving.. + K a [H ] + -15 [H ] = 1.8 x10 (look up the bronsted –lowry table to calculate) pH= 4.74 + + In a buffer solution, K =a[H ]
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