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Basic Buffers Notes.pdf

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Chemistry 1027A/B
Tom Haffie

Unit: Equilibrium in Aqueous Solution Module: Buffers [page 1 of 1] Basic Buffers • A basic buffer is a buffer that has been designed in such a way that it can resist large changes in pH and keep a solution in the basic realm. • If acid is added to a buffer solution, the weak base will react with the acid forming a weak acid and water until all of the weak base is consumed. • If base is added to a buffer solution, the weak acid will react with the base forming a weak base and water until all of the weak acid is consumed. In order to create a basic buffer it is necessary to use a base which reacts more with water that its conjugate acid. i.e. b > Ka. Basic buffer problems are K broblems. To get the Kbof the conjugate base apply the equality K = K • K w a b Using K bt is possible to compute the pH of the buffer system where pH = 14 – pOH. 0.10 mol HCl added to 0.30 mol NH in3enough wat
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