Bubbles in buret experimental error

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SUMMARY

The presence of bubbles in a buret during titration leads to inaccurate measurements of titrant volume, resulting in an overestimation of analyte concentration and mass. Specifically, if bubbles remain in the buret, they displace the liquid, causing the measured volume to exceed the actual volume used. This miscalculation ultimately results in lower than expected results for the analyte concentration. Understanding the behavior of bubbles—whether they rise or remain stationary as the titrant level changes—is crucial for accurate titration outcomes.

PREREQUISITES
  • Understanding of titration techniques
  • Familiarity with buret operation
  • Knowledge of volumetric analysis
  • Basic principles of gas behavior in liquids
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  • Research the impact of gas bubbles on volumetric measurements in titrations
  • Learn about proper buret cleaning and preparation techniques
  • Explore methods to minimize bubble formation during titration
  • Study the principles of accurate concentration calculations in analytical chemistry
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Chemistry students, laboratory technicians, and anyone involved in analytical chemistry who seeks to improve the accuracy of titration results.

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When bubbles are not removed from a buret before a titration, the measured volume of titrant used is more than the actual volume used. Then the analyte concentration will be greater than the actual concentration, and the mass of the analyte will be greater as well.

Instead, it will actually lead to low results. Could anyone explain why, and where my reasoning went wrong? Thanks.
 
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It actually depends on what happens to the bubbles - whether they go up (or stay in place when the titrant levels passes them, which is effectively the same), or go down with the titrant.

I saw them do both.
 
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