# ProbSet3 - CEM 834 PROBLEM SET 3 Due at the beginning of...

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CEM 834 PROBLEM SET 3 FALL 2005 Due at the beginning of class on Monday, October 17, 2005. For this problem set, you may neglect activity corrections. For each problem, show all work clearly and state any assumptions that you make. Assumptions should be verified to give no more than 5% error in the final solution, unless otherwise stated. For any problems in which you utilize a spreadsheet program, please print at least the first page of the spreadsheet and show all formulas as you enter them into the program. 1. NASA has asked you to develop a technique for the analysis of metals in the water supply in a space shuttle or space station. Because the environment on a space station is closed, the water needs to remain safe for human exposure with little treatment, and therefore you must work in the pH range of 5.00 – 9.00. a. In these types of analyses, a buffer is used to avoid hydrolysis of the metals. Determine which of the following buffer solutions would provide the largest buffer capacity ( Π ) over this pH range (5.00 – 9.00) by graphing the buffer capacity as a function of pH. Use pH values from 0.00 to 14.00 in your graph. The acid dissociation constants ( d a K ) are given at 25 °C. i. 0.10 M acetic acid d a K = 1.75 x 10 -5 0.10 M sodium acetate ii. 0.10 M hypochlorous acid d a K = 2.88 x 10 -8 0.10 M sodium hypochlorite iii. 0.10 M sodium bicarbonate d

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## This note was uploaded on 07/25/2008 for the course CEM 834 taught by Professor Mcguffin during the Fall '05 term at Michigan State University.

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ProbSet3 - CEM 834 PROBLEM SET 3 Due at the beginning of...

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