ch17_aqueous equilibria

ch17_aqueous equilibria - b What ratio of acid[HA to...

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Chapter 17: Additional Aspects of Aqueous Equilibria 1. Calculate the percent ionization of 0.10 M propionic acid (Ka = 1.3 x 10 -5 ). 2. Predict whether the pH of 1 L of a 0.10 M acetic acid solution increase, decrease, or remain constant when 0.050 mol sodium acetate is added. 3. Calculate the pH of the solution in #2 before and after the addition of sodium acetate (K a of HAc is 1.8x10 -5 ). 4. Consider the following buffer solutions. Solution #1: 0.30 M HC 2 H 3 O 2 / 0.30 M NaC 2 H 3 O 2 Solution #2: 0.20 M HC 2 H 3 O 2 / 0.30 M NaC 2 H 3 O 2 Solution #3: 0.30 M HC 2 H 3 O 2 / 0.20 M NaC 2 H 3 O 2 a. Which solution should have the highest pH? b. Which solution should have the greatest buffering capacity? c. Which solution should have the least buffering capacity when strong base is added? 5. Consider the following buffer solutions. NH 3 /NH 4 NO 3 K b (NH 3 ) = 1.76x10 -5 H 3 PO 4 /NaH 2 PO 4 K a (H 3 PO 4 ) = 1.0x10 -2 NaH 2 PO 4 /Na 2 HPO 4 K a (H 2 PO 4 - ) = 2.0x10 -7 HC 2 H 3 O 2 /NaC 2 H 3 O 2 K a (HC 2 H 3 O 2 ) = 1.75x10 -5
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a. Which buffer system would be the best choice for preparing a solution of pH 5?
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Unformatted text preview: b. What ratio of acid [HA] to conjugate base [A-] would you use to prepare the pH 5 solution using the system you chose in part (a)? 6. The K sp for Ca 3 (PO 4 ) 2 is 2.0x10-20 and the K sp for CaSO 4 is 2.00x10-4 . Write the K sp expression for each compound. 7. Solid silver chromate (Ag 2 CrO 4 ) was added to pure water. After the solution was stirred for several days to ensure a state of equilibrium, analysis of the solution showed that its silver ion concentration was 1.3x10-3 M. Calculate the K sp for Ag 2 CrO 4 . 8. The K sp for Mg(OH) 2 is 1.8x10-11 . a. Calculate the [Mg 2+ ] and [OH-] in a saturated solution of magnesium hydroxide solution. b. Calculate the pH of the magnesium hydroxide solution. 9. Which of the following substances will be more soluble in acidic solution than in basic solution? Ni(OH) 2 CaCO 3 AgF AgCl...
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ch17_aqueous equilibria - b What ratio of acid[HA to...

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