Read the article watch the video on "pH and Buffers" and answer the following questions and the questions in the 3rd article above "Buffer Theory and Questions"
1) What is a buffer solution? 2) What are the characteristics of a good buffer? 3) Explain why pH = pKa in a good buffer. 4) Use the Henderson-Hasselbalch Approximation to answer the following question: What is the pH of a buffer 0.500 moles acetic acid and 0.500 moles acetate ion and the total volume is 5 L? The Ka for acetic acid is 1.75×10−5. (answer: pH = 4.76). 5) if 0.35 moles of HCl was added to the buffer in the previous qn, what would be the new pH? ( answer: new pH = 4.11) |
|
Use the Henderson-Hasselbalch Approximation ( pH = pKa + log([base]/[acid] ) to answer the questions on the following worksheet. If your still having trouble with the Henderson-Hasselbalch Approximation, read the webpage above. Solutions are given in the file below called Buffer worksheet answers.
If your still struggling with Buffers this website may help.
|