Chapter 16 - Buffer solutions Solutions that resist a...

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Buffer solutions Solutions that resist a change in pH Preparation of buffer solutions: Weak acid + its conjugate base Weak base + its conjugate acid
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pH = pKa + log [ conjugate base] [acid] [H+] =K a x [HB] [B - ] Henderson-Hasselbalch equation: Problem: A buffer is prepared by dissolving lactic acid Hlac (Ka = 1.4 x 10 -4 ) and sodium lactate NaLac. Calculate the pH if the buffer is made of 1.00 mol of sodium lactate and 1.00 mol of lactic acid in enough volume of water to form a 550.0 ml solution. pH of buffer solutions
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Choosing a buffer system pH of a buffer depends on a.K a of the acid b.Mole ratio of weak acid to its conjugate base Common ion effect Problem: A buffer is prepared by dissolving lactic acid Hlac (Ka = 1.4 x 10 -4 ) and sodium lactate NaLac. Calculate the pH if the buffer is made of 1.00 mol of sodium lactate and 1.00 mol of lactic acid in enough volume of water to form a 550.0 ml solution. Calculate the pH of this solution after the addition of 0.04 mol of HCl
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Indicators are weak acids.
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Chapter 16 - Buffer solutions Solutions that resist a...

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