Calculate the pH of the NH3/NH4+ buffer after the addition of the HCl. How does it compare to the experimental value?

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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Calculate the pH of the NH3/NH4+ buffer after the addition of the HCl. How does it compare to the experimental value? 

Reort
Part Four- Effectiveness of an NH3/NH4* Buffer
Label two regular size test tubes 1 and 2 and place them in rack. Into tube 1 combine 5.0 mL of
0.10M NH4C1 and 5.0 mL of 0.10M NH3 and mix well. Into test tube 2 add 10.0 mL of distilled
water. Using a pH meter, measure the pH of the buffer and the distilled water and record in the
table below (initial pH). Add 5.0 mL of 0.010M HCl to each test tube and measure the pH again.
Discard the contents and rinse the test tubes. Again, into tube 1 combine 5.0 mL of 0.10M NH4C1
and 5.0 mL of 0.10M NH3. Into test tube 2 add 10.0 mL of distilled water. This time, add 5.0 mL
of 0.010M NaOH to each test tube and measure the pH again.
pH after
addition of HCI
pH after
addition of NAOH
Test Tube
Initial pH
(1) NH3/NH4* buffer
5.10
3.03
8.47
(2) distilled water
6.35
2.83
11.29
Transcribed Image Text:Reort Part Four- Effectiveness of an NH3/NH4* Buffer Label two regular size test tubes 1 and 2 and place them in rack. Into tube 1 combine 5.0 mL of 0.10M NH4C1 and 5.0 mL of 0.10M NH3 and mix well. Into test tube 2 add 10.0 mL of distilled water. Using a pH meter, measure the pH of the buffer and the distilled water and record in the table below (initial pH). Add 5.0 mL of 0.010M HCl to each test tube and measure the pH again. Discard the contents and rinse the test tubes. Again, into tube 1 combine 5.0 mL of 0.10M NH4C1 and 5.0 mL of 0.10M NH3. Into test tube 2 add 10.0 mL of distilled water. This time, add 5.0 mL of 0.010M NaOH to each test tube and measure the pH again. pH after addition of HCI pH after addition of NAOH Test Tube Initial pH (1) NH3/NH4* buffer 5.10 3.03 8.47 (2) distilled water 6.35 2.83 11.29
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