Q4_S08_key

Q4_S08_key - Name ___A. Key_________ Dr. A. H. Martin Chem...

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Unformatted text preview: Name ___A. Key_________ Dr. A. H. Martin Chem 114 Quiz 4A March 13, 2008 Correct dissociation equations must be given and all dependent variables must be defined for full credit on all problems. (2) 1. Indicate whether aqueous solution of the following salts are ACIDIC, BASIC, or NEUTRAL. For solutions that are not neutral, indicate the formula of the ion causing the change in acidity. acidity ion causing KNO 2 __basic_____ _____NO 2 1- ______ C 2 H 5 NH 3 Cl _acidic______ __C 2 H 5 NH 3 1+ ________ (4) 2. Calculate the pH of a 0.50 M NaOBr solution. (K a HOBr = 2.5x10-9 ) NaOBr Na 1+ + OBr 1- OBr 1- + H 2 O HOBr + OH 1- 1- = K w K a HOBr = 1.0x10- 14 2.5x10- 9 = 4.0x10- 6 [OBr 1- ] [HOBr] [OH 1- ] initial 0.50 M (from NaOBr) change -x x x where x = [OH 1- ] produced equilibrium 0.50 x x x = [ 1- ] [OBr 1- ] = (x)(x) 0.50 - x = 4.0x10- 6 Ignoring the subtracted x x = [OH 1- ] = 0.0014 pOH = 2.85 pH = 11.15 (4) 3. Calculate the pH of a solution that is 0.50 Calculate the pH of a solution that is 0....
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Q4_S08_key - Name ___A. Key_________ Dr. A. H. Martin Chem...

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