PS4 - Chem 215 Spring 2007 Problem Set 4 Due Friday Sept 21...

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Chem 215, Spring 2007 Problem Set 4 Due Friday, Sept. 21, 2:00 PM Name:_______________________ Student TA: ___________________ Lab Day: ____________________ Suggested Additional Problems- Ch 7: 27, 31, 37, 43, 45, 51, 53, 69, 73, 77, 105, 109 1. Calculate [H 3 O + ], [OH - ] and pH for: a) The solution prepared by mixing 90.0 mL of 5.00 M HCl and 30.0 mL of 8.00 M HNO 3 . b) The solution prepared by dissolving 0.56g of benzoic acid (C 6 H 5 COOH, K a = 6.4 x 10 -5 ) in enough water to make 1.00 L of solution. c) A 1.0 x 10 -7 M solution of HCl. Hint: You need to consider the H 3 O + resulting from the presence of HCl, as well as from the H 3 O + and OH - due to the autoionization of water:
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Chem 215, Spring 2007 Problem Set 4 Due Friday, Sept. 21, 2:00 PM 2. Captain Kirk, of the Starship Enterprise, has been told by his superiors that only a chemist can be trusted with the combination to the safe containing the dilithium crystals that power the ship. The combination is the pH of solution A described below, followed by the pH of solution B. For example, if the pH of solution A is 3.47, and that of solution B is 8.15, then the combination to the safe is 3-47-8-15. The chemist must find the combination using only the information below.
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