Post-Lab Questions 1. Which gives a better measure of the pH: universal pH paper
ID: 522575 • Letter: P
Question
Post-Lab Questions 1. Which gives a better measure of the pH: universal pH 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 do was the most effective in resisting a change in pH? How does your data support this conclusion? 4. You have a buffer system made up of equimolar amounts of carbonic acid, Hzco, and sodium bicarbonate, NaHCO- Write equations to show how this b behaves when Ca) HCl 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 the Henderson-Hasselbalch equation shown in the Background section. Use for pKa values: carbonic acid 6.37 and acetic acid 4.75. Are these calculated values in agreement with your measured pH values?Explanation / Answer
A pH meter is normally assisted by the use of a computer or a digital user interface.
The pH paper can be likened to the use of a Galileo thermometer.
pH meter
If they are treated with care, calibrated regularly, maintained according to the manufacturers recommendation, and stored correctly you can expect a pH meter to be accurate and durable.
pH paper is great for quick qualitative work it fails at highly accurate quantitative work. If the accuracy you desire is within one pH value or two, paper is the way to go.