Sodium Hydroxide Standardization
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No report will be accepted for credit after November 28, 2021
Grade:
Lab average to date:
Overall average to date:
Results (Sodium Hydroxide Standardization – successful trials only) (35 points)
NOTE: KHP contains no phosphorous. Its formula is given in the laboratory directions along with its molar mass.
KHP Titrations |
1 | 2 |
| Mass of KHP | ||
| Moles of KHP | ||
| Initial Volume Vo | ||
| Final Volume Vf | ||
| Volume required (Vf – Vo) | ||
| Molarity of NaOH | ||
| Average Molarity of NaOH |
Results (Acetic Acid Content of Vinegar – successful trials only) (35 points)
Use the follwing value, determined by all students performing the lab, to complete the table below:
Class Average Molarity for NaOH (excluding outliers): 0.2536M
Vinegar Titrations |
1 | 2 |
| Volume of Vinegar | ||
| Moles of Acetic Acid in Vinegar (calculated) | ||
| Initial Volume Vo | ||
| Final Volume Vf | ||
| Volume required (Vf – Vo) | ||
| Molarity of Acetic Acid in Vinegar | ||
| Average Molarity of Acetic Acid | ||
| Measured % Acetic Acid in vinegar sample | ||
| % error (As described in the directions) |
Questions
1. Show or explain your calculation for determining Measured % Acetic Acid in vinegar sample. You may incorporate a scan of your handwritten calculations if you prefer. (20 points)
2. If you or one of your laboratory partners misread the procedure and added 100 mL of distilled water to the solid KHP rather than 50 mL of water (Procedure 1.5), how would this affect the concentration of sodium hydroxide solution that you measured? Explain briefly . (10 points)
