What would be the predicted pH's? Would they be similar to the actual pH's from procedure? Original After 45 µl of 5 | After 205 µl more After 205 µL more After 45 µl more solution M NaOH of 5M NaOH of 5M NaOH of 5 M NaOH Actual pH 4.30 6.05 6.90 11.01 11.29 Predicted pH

Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter15: Acid–base Equilibria
Section: Chapter Questions
Problem 95AP
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1. Prepare 50-mL of a 50 mM H,PO, solution in a 50-ml conical tube. Molar mass of NaH2PO4
H2O used is 138 moles
2. Check the pH of this solution and record.
3. A5 M NAOH solution has been provided.
4. Add 45 µl of 5 M NaOH into the 50 mM H2PO, solution. Check the pH and record.
5. Add 205 µl of 5M NaOH into the 50 mM H2PO4 solution. Check the pH and record.
6. Add 205 µL more of 5M NaOH into the 50 mM H2PO, solution. Check the pH and record.
7. Add 45 µl of 5 M NaOH into the 50 mM H2PO, solution. Check the pH and record.
Complete the following table "predicted pH." Please show all work on a separate sheet of paper
and attach. Note that the pK, of H2PO, is 7.2.
What would be the predicted pH's? Would they be similar to the actual pH's from procedure?
After 45 µl of 5 | After 205 µl more
of 5M NaOH
Original
After 205 µl more
After 45 µl more
solution
M NaOH
of 5M NaOH
of 5 M NaOH
Actual pH
4.30
6.05
6.90
11.01
11.29
Predicted pH
Transcribed Image Text:1. Prepare 50-mL of a 50 mM H,PO, solution in a 50-ml conical tube. Molar mass of NaH2PO4 H2O used is 138 moles 2. Check the pH of this solution and record. 3. A5 M NAOH solution has been provided. 4. Add 45 µl of 5 M NaOH into the 50 mM H2PO, solution. Check the pH and record. 5. Add 205 µl of 5M NaOH into the 50 mM H2PO4 solution. Check the pH and record. 6. Add 205 µL more of 5M NaOH into the 50 mM H2PO, solution. Check the pH and record. 7. Add 45 µl of 5 M NaOH into the 50 mM H2PO, solution. Check the pH and record. Complete the following table "predicted pH." Please show all work on a separate sheet of paper and attach. Note that the pK, of H2PO, is 7.2. What would be the predicted pH's? Would they be similar to the actual pH's from procedure? After 45 µl of 5 | After 205 µl more of 5M NaOH Original After 205 µl more After 45 µl more solution M NaOH of 5M NaOH of 5 M NaOH Actual pH 4.30 6.05 6.90 11.01 11.29 Predicted pH
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