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CHM 112
Section 1

Homework Assignment #19
Due March 27, 2006 by 8:05 a.m.

Practice (not to be turned in): Problems 15.81, 15.133

A solution is prepared at 25 °C using sodium phosphate and sodium hydrogen phosphate. The concentration of the sodium phosphate equals the first two digits of your Student ID Number divided by 100 in units of molarity. The concentration of the sodium hydrogen phosphate equals the eighth and ninth digits of your Student ID Number divided by 100 in units of molarity.

a) Find the pH of the buffer solution.

b) 1.0 g of HCl(g) is added to 1.00 L of the buffer solution. Find the new pH.

c) 0.50 g of NaOH(s) is added to 1.00 L of the buffer solution. Find the new pH.



Turn in the following on a clean, full sheet of paper (not torn out of a notebook):

Name
Student ID Number
The answers to the questions. Show your work.