| 1. | Safety |
| 2. |
Objectives/Overview |
| 3. |
Procedures |
|
4. |
Observations |
| 5. | |
| 6. | |
| 7. | |
| 8. | Conclusions |
| 9. | Calculations/Set-Ups |
| 10. | Grading Scale |
| 11. | Review Prelab Questions |
|
12. |
Review Postlab Questions |
Experiment
17
Titration
of a Diprotic Acid: Identifying an Unknown
CALCULATIONS/SET-UPS
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mass of unknown acid = |
(mass weighing boat + unknown acid) - (mass empty weighing boat) |
 |
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volume of NaOH added at the equivalence point = |
(vol. NaOH added BEFORE largest pH increase + vol. NaOH added AFTER largest pH increase) / 2 |
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moles of NaOH = |
(molarity of NaOH) x (vol. NaOH at eq. pt, in liters) |
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moles of diprotic acid, H2X = |
1/2 moles NaOH |
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molar mass of diprotic acid = |
(mass unknown acid) / (moles of diprotic acid) |
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theoretical molar mass of diprotic acid= |
it will be calculated using a periodic table and the appropriate chemical formula provided in your lab manual |
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Percent error in molar mass of diprotic acid = |
[?theoretical molar mass – experimental molar mass ?/ theoretical molar mass ] x 100 |
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