CH202 Postlab 07 Buffers

CH202 Postlab 07 Buffers - CH202 Postlab 07 Buffers

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CH202 Postlab 07 Buffers (Postlab) SCHNELL ZACHARY EUGENE CH202, section 005, Fall 2008 Instructor: weiming zheng TA Web Assign Current Score: 21 out of 25 Due: Thursday, October 23, 2008 11:00 PM EDT The due date for this assignment is past. Your work can be viewed below, but no changes can be made. Request Extension 1. 20/20 points In this question, you will calculate the expected pH's of your solutions, and compare them to your measurements. a. Use the data from Part A to fill in the following table. Report your calculated pH's to two places past the decimal point. Remember, pH's are calculated differently depending on whether you have a weak acid, a weak base, or a buffer. Solution # mmol HC 2 H 3 O 2 mmol C 2 H 3 O 2 1- measured pH calculated pH 1A 18 18 mmol 0 0.0 mmol 2.48 2.48 2.48 2.48 2A 18 18 mmol 6.0 6.0 mmol 4.26 4.26 4.26 4.26 3A 0 0.0 mmol 18 18 mmol 11.52 11.52 9.26 9.26 4A 6.0 6.0 mmol 18 18 mmol 9.74 9.74 5.22 5.22 5A 12 12 mmol 12 12 mmol 4.74 4.74 4.74 4.74 b. Use the data from Part B to fill in the following table. Enter the
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This note was uploaded on 02/03/2009 for the course CH CH 102, 20 taught by Professor Ta,ta,sandberg during the Fall '08 term at N.C. State.

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CH202 Postlab 07 Buffers - CH202 Postlab 07 Buffers

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