Questions and Answers
What is the titrant for this experiment?
NaOH
Is the indicator generally added to the titrant or the analyte in a titration?
What is the primary standard in this experiment and define primary standard.
Potassium hydrogen phthalate; KHC8H4O4; high purity, large molar mass, nonhygroscopic, reacts in predictable way
What is the secondary standard in this experiment and define secondary standard.
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Distinguish between stoichiometric point and endpoint.
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When rinsing the buret after cleaning it with soap and water, should the rinse be dispersed through the buret tip or the top opening of the buret? Explain.
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Why is the final rinse done with NaOH titrant rather than with deionized water? Explain.
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Calculate the mass of KHC8H4O4 (molar mass=204.23 g/mol) that reacts with 15 mL of the 0.15 M NaOH solution.
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Study Notes
Titration Basics
- Titrant used in the experiment is sodium hydroxide (NaOH).
- The indicator is generally added to the analyte, the solution being tested, rather than the titrant.
Standards and Their Definitions
- Primary standard: potassium hydrogen phthalate (KHC8H4O4) known for high purity, large molar mass, non-hygroscopic properties, and consistent reactivity.
- Secondary standard: sodium hydroxide (NaOH) which is quantified via known moles in a measured solution and reacts with the analyte.
Stoichiometry in Titration
- Stoichiometric point is reached when the precise mole ratio of reactants is achieved.
- Endpoint is indicated by a color change in phenolphthalein, signaling that the reaction has completed.
Buret Rinsing Techniques
- When rinsing a buret post-cleaning, the rinse solution should be sent through the buret tip to ensure all water is expelled, preventing dilution of the titrant.
- The final rinse should be conducted with the titrant (NaOH) to remove residual contaminants, ensuring the accuracy of the experiment.
Calculation of Mass in Titration
- For 15 mL of 0.15 M NaOH, the moles of NaOH calculated are 0.00225 mol.
- This amount corresponds to 0.00225 mol of KHC8H4O4 based on a 1:1 mole ratio.
- The mass of KHC8H4O4 is computed as 0.4595 g, calculated using its molar mass of 204.23 g/mol, rounded to the correct number of significant figures.
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Description
Test your knowledge on the fundamentals of titration, including the use of sodium hydroxide as a titrant and the importance of various standards. This quiz covers concepts like stoichiometric points and the proper techniques for rinsing a buret.