Chapter 17 - Chapter 17 Chapter 17 Additional Aspects of...

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Unformatted text preview: Chapter 17 Chapter 17 Additional Aspects of Aqueous Additional Aspects of Aqueous Equilibria Equilibria CHEMISTRY The Central Science 9th Edition The solubility of a weak electrolyte is decreased by the addition of a strong electrolyte that has a ion in common with the weak electrolyte. The Common Ion Effect The Common Ion Effect Class Practice Problem Class Practice Problem What is the pH of a solution made by adding 0.30 mol of acetic Equilibria of Acid-Base Equilibria of Acid-Base Buffer Systems Buffer Systems Why do some lakes become acidic when showered with acid rain, while others show no change in their pH? How does blood maintain a certain pH while in constant contact with countless cellular acid-base reactions that occur in the body? And, how can chemists maintain a certain pH level (i.e., +- Buffer work thorough the phenomenon known as the Common-ion Effect. A buffer must contain an acidic component to react with -- How Due Buffer Solutions Work How Due Buffer Solutions Work Buffer Diagram, Figure 17.2 Buffer Diagram, Figure 17.2 Buffers are solutions that resist changes in their pH caused by external force. A buffer consists of a mixture of a weak acid (HA) and a Buffered Solutions Buffered Solutions HX( aq ) H + ( aq ) + X- ( aq ) ] A [ ] HA [ ] H [ ] HA [ ] A ][ H [-- a a K K = = + + HA (aq) HA (aq) Class Practice Problem Class Practice Problem Calculate the pH of a buffer solution (a) consisting of 0.50 M Buffer capacity is the amount of acid or base neutralized by the buffer before there is a significant change in pH. Buffer capacity depends on the composition of the buffer. The greater the amounts of conjugate acid-base pair, the greater the buffer capacity. Buffered Capacity and pH Buffered Capacity and pH The amount of strong acid or base added results in a neutralization reaction:-- 2 Adding Strong Acids or Adding Strong Acids or Bases to Buffers Bases to Buffers Class Practice Problem Class Practice Problem Calculate the pH of a buffer solution (a) consisting of 0.50 M ]...
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Chapter 17 - Chapter 17 Chapter 17 Additional Aspects of...

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