LabTest2.sp05 - Chemistry 220 Lab Test #2 Spring 2005 Name:...

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Chemistry 220 Lab Test #2 Spring 2005 N a m e : Directions: Answer the questions in the spaces provided. Show all work and units to receive credit. 1. (20 points) Calcium oxalate (CaC 2 O 4 ) is only slightly soluble in water. In order to determine the K sp of calcium oxalate at room temperature, 30 g of calcium oxalate was placed into a beaker containing 100 mL of water and stirred for one hour. The solution was then filtered and a 25.00-mL sample was titrated with standardized 0.100 M HCl solution. ( Note: the oxalate ion (C 2 O 4 2 ) accepts 2 protons.) Initial buret volume (mL): 3.44 mL Final buret volume (mL): 18.78 mL Based on these data, A) Calculate the molar solubility of CaC 2 O 4 . B) Calculate the K sp of CaC 2 O 4 . C) Calculate the solubility of CaC 2 O 4 . in the units of: g/100 mL .
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2. (20 points) A 15.0-mL sample of an unknown monoprotic acid (HA) of unknown concentration was titrated using standardized 0.250 M NaOH solution. The pH was monitored during the titration, and the following titration data was collected.
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This note was uploaded on 03/18/2010 for the course BIOL 220 taught by Professor Bates during the Spring '10 term at Skyline College.

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LabTest2.sp05 - Chemistry 220 Lab Test #2 Spring 2005 Name:...

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