243 Name Locker Number _ Date Please print last nama rs REPORT SHEET (continued)

Question

243 Name Locker Number _ Date Please print last nama rs REPORT SHEET (continued): Experiment 17 Acids, Bases, pH, Hydrolysis, and Buffers 4. Effect of NaOH on the pH of Deionized Water: pH of freshly boiled deionized H,O pH after 1 drop of 0.10 M NaOH after 2 drops after 3 drops after 4 drops after 5 drops E. General Questions In experiments D-1 and D-3, hydrochloric acid was added one drop at a time to a buffer solution and to deionized water. Compare the changes in pH observed with cach drop of acid added to the buffer and to the deionized water. Did the buffer minimize changes in pH with each addition compared to water? If it did, explain in general terms how the buffer was able to do it. 1. 2. In experiments D-2 and D-4, sodium hydroxide was added one drop at a time to a buffer solution and to deionized water. Compare the changes in pH observed with each drop of base added to the buffer and to the deionized water. Did the buffer minimize changes in pH with each addition compared to water? If it did, explain in general terms how the buffer was able to do it.

Explanation / Answer

Q4

the addition of NaOh to water will cause NaOH = Na+ +OH- ions presence

note that Oh- will increase pH, that is, it bcomes very basic

for the freshly boiiled H2O --> pH = 7, i.e .neutral

once we add some NaOH --< pH increaes drastially, i.e. up to pH = 13-14 units

when we keep adding drops, i.e. 2nd,3rd, 4th... then the pH keeps icnreasing, but not as fast as the FIRST drop

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