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Unformatted text preview: 3 , NaF, KNO 2 , none of these (2 points) Write an equation for the reaction that occurs when this salt dissolves in water and makes the solution acidic, or state why none do. 3. (a) (8 points) What is the pH of a buffer solution prepared from adding 60.0 mL of 0.36 M ammonium chloride (NH 4 Cl) solution to 50.0 mL of 0.54 M ammonia (NH 3 ) solution? (K b for NH 3 is 1.8 x 10-5 ). (b) (13 points) What is the final pH after 10.0 mL of 0.200 M NaOH solution is added to a 50.0 mL solution of 0.400 M acetic acid (CH 3 COOH)? K a for acetic acid is 1.8 x 10-5 . (c) (3 points) You don’t have to add acid or base to a solution to change the pH, you can instead dilute the solution. What is the new pH if 100 mL of a solution of HCl with pH = 0.52 is diluted by addition of 200 mL of pure water? 4. (5 points) Calculate the solubility of the salt M 3 X 4 (containing M 4+ and X 3- ions) if the K sp = 4.2 x 10-8...
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- Spring '07