Which gives a better measure of the pH: universal PH paper or a pH meter? Can di

Question

Which gives a better measure of the pH: universal PH paper or a pH meter? Can distilled water be an effective buffer? Use data from your experiment to support your answer. 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? You have a buffer system made up of equimolar amounts of carbonic acid, H_2CO_3, and sodium bicarbonate, NaHCO_3. Write equations to show how this buffer behaves when HCl is added and NaOH is added. 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 pK_a values: carbonic acid = 6.37 and acetic acid = 4.75. Are these calculated values in agreement with your measured pH values?

Explanation / Answer

1) The universal pH paper doesn't give us the clear idea about the pH of the solution we have to check the colour and predict that the pH may me acidic or basic .It mostly depends on the observer how good he is in differentiating between the colours ,while the pH-meter gives us the exact value of the pH and we don't need to look for anything else.So,pH-meter is a better choice among these two methods.

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