1. Which gives a better measure of the ph universal ph paper or a ph meter ? 2 C
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Question
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 system (a,b,c or d) was the most effective in resisting a change in ph? How does your data support this conclusions?
4. You have a buffer system made up of equimolar amounts of carbonic acid, H2CO3 and sodium bicarbonate, NaHCO3. Write equations to show how this buffer behaves when (a) HCI is added and (b) NaON is added.
5. Calculate the expected ph values of the buffer systems from the experiments (a, b, c d) using the Henderson _ Hasselbalch eqution shown in the bavkground section. Use for pka values
a.
b.
c.
d.
Are these calculated values in agreement with your measured ph values?
Explanation / Answer
1. pH meter always gives a better measure of the pH. Beacause here if you prepare a solution of certain pH and dip the rod of pH meter then you can able to know the pH of the solution. But you have to make sure that you have used all clean appratus.
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