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lecture8_040107

lecture8_040107 - Buffers Which of the following are good...

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Buffers Which of the following are good buffers? a) 0.100M NaCl b) 0.100M NaCl, 0.100M NH 4 Cl c) 0.100M CH 3 NH 2 /0.150M CH 3 NH 3 + d) 0.100M HCl, 0.050 NaNO 2 a) No buffering ability b) No buffering ability c) Good buffer d) No buffering ability
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Polyprotic acids What is the pH of a 0.250M solution of H 2 SO 4 ? 1 st proton dissociation: 0.250M H 3 O + 2 nd dissociation: [HSO 4 - ][ H 3 O + S O 4 2- ] Initial 0.250 0.250 0 Change -x +x +x Equilibrium 0.250 – x x x pH = 0.583 pH = 0.602 Did not cover but still a good problem
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Titrations 4 points during a titration: 1. No strong acid/base added z Weak acid or base problem 2. Before equivalence point z Buffer problem with neutralization. Determine moles
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lecture8_040107 - Buffers Which of the following are good...

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