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May 29, 2015

Homework Help: Chemistry

Posted by Alexandra on Sunday, November 14, 2010 at 6:07pm.

In the study of biochemical processes, a common buffering agent is the weak base trishydroxymethylaminomethane, often abbreviated as Tris. At 25 C, Tris has a pKb of 5.91.
The hydrochloride can be abbreviated as Tris HCl.

What volume of 10.0 M NaOH is needed to prepare a buffer with a pH of 7.79 using 31.52 g of Tris HCl?

I found this answer to be 6.6755 mL


This is what I can't figure out:

The buffer from Part A is diluted to 1.00L . To half of it (500 mL ), you add 0.0250 mol of hydrogen ions without changing the volume. What is the pH of the final solution?

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