Experiment – Standardization of an Unknown Concentration Sodium
Hydroxide Solution and the Determination of the Molecular Mass of an
Unknown Acid
Directions: To complete the experiment, read the laboratory experiment in the manual, watch the video below, and complete the data table below.
The experimental report must be submitted to the appropriate Blackboard assignment folder.
Reading Assignment: Standardization of Unknown Concentration
Experimental Videos: Standardization of Unknown Concentration of Sodium Hydroxide Solution |
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Simulated Data:
Complete the data table. Remember Significant figures
Part 1A. Determining the concentration of an unknown NaOH solution using KHP (use data from video for this part)
| Trail 1 | Trail 2 | Trail 3 |
Mass of KHP used (g) |
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Moles of KHP (mol) |
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Initial Buret Reading (mL) |
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Final Burret Reading (mL) |
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Volume NaOH used (mL) |
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Moles of NaOH used (mol) |
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Molarity of NaOH (M) |
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Average molarity of NaOH |
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Standard Deviation |
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RSD (%) |
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Part 2. Determining the molar mass of an unknown acid
| Trail 1 | Trail 2 | Trail 3 |
Uknown Number/Letter | 4 | 4 | 4 |
Mass of unknown acid used (g) | 0.201 | 0.202 | 0.2 |
Initial Buret Reading (mL) | 1.00 | 0.10 | 0.00 |
Final Burret Reading (mL) | 35.30 | 39.60 | 34.00 |
Volume NaOH used (mL) |
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Moles of NaOH used (mol) |
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Moles of unknown acid (mol) |
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Molar mass of unknown acid (g/mol) |
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Average molar mass (g/mol) |
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Standard Deviation |
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RSD (%) |
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Post Lab Questions
- Answer only questions 6 from the lab manual.
- What is the purpose of a scout titration?