230_Sp10_E3_blank(1) - CHEM 230 Sp 10 Exam 3 p1 Name 1(20...

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CHEM 230 Sp 10 Exam 3 p1 Name:_____________________ 1) ( 20 pts ) 20.0 mL of a 0.1M aqueous acetic acid (pKa = 4.75) solution is titrated with 0.1 M NaOH. Find the exact values of the coordinates for the three points listed in the table below: 1) half-stoichiometric point; 2) the stoichiometric point; 3) the point where 23mL of the NaOH have been added. Place those points on the graph and sketch the correct shape of the curve through them. mL NaOH added pH 1) ½ stoichiometric point 2) stoichiometric point 3) 23 Show your work below: Fill in the columns for mL NaOH added and pH in the table. On graph plot 3 points and draw shape of the titration curve.
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CHEM 230 Sp 10 Exam 3 p2 Name:_____________________ 3) An aqueous solution of Sr(NO 3 ) 2 is added slowly to 1.0 L of a well-stirred solution containing 0.020 mole F - and 0.10 mole SO 4 2- at 25ºC. (You may assume that the added Sr(NO 3 ) 2 solution does not affect the total volume of the system.) SrSO 4 K sp = 3.5x10 -7 SrF 2 K sp =2.5x10 -9 2) ( 6 pts ) If you dilute an aqueous buffer solution by adding water, will the pH of the solution change, assuming that the Hendeson-Hasselbalch equation can still be applied? ( Circle one) the pH will go down the pH will stay the same the pH will go up Briefly explain your answer. a) (4 pts ) What is the [Sr 2+ ] when SrSO 4 begins to precipitate? b) (4 pts ) What is the [Sr 2+ ] when SrF 2 begins to precipitate? c) (2
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230_Sp10_E3_blank(1) - CHEM 230 Sp 10 Exam 3 p1 Name 1(20...

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