Exp. 07 – Determining an Unknown Concentration
Why are we doing this experiment?
- Titrations are frequently used to accurately and precisely determine the concentration of an unknown solution.
- Titration calculations involve the use of stoichiometry.
How do I prepare for lab?
- Additional information
- OpenStaxx: Section 4.3, 4.5, 14.7
What will I do in lab?
- Standardize your sodium hydroxide solution to determine it’s precise (to 4 decimal places) concentration.
- Titrate the citric acid solution to determine its concentration.
- Technique Videos to Watch:
- Common Errors in Lab
- Failing to record the exact volumes used when preparing solutions.
- Not aligning the drop counter with the buret correctly.
- Having a stream of solution instead of drops.
- Not reading the buret to two decimal places.
What will I do after lab?
- Post-lab Checklist (i.e. things you should be able to do for the lab practical)
- Calculate the average and standard deviation of the molarity.
- Understand the properties and purpose of a primary standard.
- Determine the concentration of an unknown acid.
- Complete titration calculations (including those who do not have a 1:1 mole ratio).
- You will not see a 1:1 molar ratio on your exam.
- Read a buret accurately.
- Understand the concept of equivalence point.
- Obtain the equivalence point from the graph of the data and/or the second derivative.
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