Lab 11: pH and Buffer Solutions POST-LABORATORY QUESTIONS 1. Which gives a bette
ID: 1042589 • Letter: L
Question
Lab 11: pH and Buffer Solutions POST-LABORATORY QUESTIONS 1. Which gives a better measure of the pH: universal pht paper or a pH meter 2. Can distilled water be an effective buffer? Use data from your experiment to support your answer 3. Which of your buffer systems (a, b, c, or d) was the most effective in resisting a change in pH? How does your data support this conclusion? carbonic acid, HCO, and 4. You have a buffer system made up of equimolar amounts of CO, write equations to show how this buffer behaves when a) Ha sodium bicarbonate, NaH is added and (b) NaOH is added. 5. Calculate the expected pH values of the buffer systems from the experiments (a, b, c, d), using Henderson-Hasselbalch equation shown in the Background section. Use for pk, values: carbonic acid 6.37 and acetic acid 4.75. a. b. C. d. Are these calculated values in agreement with your measured pH values?Explanation / Answer
(1)
pH meter is more accurate in determining pH of a given solution because it uses digital technology.
(2)
No distilled water can not be effective buffer because adding a small amount of hydronium or hydroxyl ions changes pH considerably.
(4)
When HCl is added the reaction that takes place is:
Na+HCO3- + HCl ---> H2CO3 + NaCl
When NaOH is added the reaction that takes place is:
H2CO3 + NaOH ---. NaHCO3 + H2O
For answering other parts you need to supply the missing data.
Hope this helps !
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.