TEFLON STOPPER BURETTE
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  1. What is a Burette?

    • burette is an essential piece of laboratory equipment commonly used in scientific measurements, particularly in chemistry and analytical laboratories.
    • By appearance, it resembles a graduated glass tube with a stopcock at the bottom.
    • The word “burette” has French origins, coined by the chemist Joseph Louis Gay-Lussac.
    • Its primary purpose is to accurately dispense and measure variable amounts of chemical solutions.
  2. Working Principle:

    • Burettes deliver a chemical solution with a known concentration into a flask or other container.
    • The stopcock valve controls the fluid flow from the burette, allowing precise dispensing either in a steady stream or drop by drop.
    • Burettes are particularly handy when dispensing and measuring liquids (and sometimes gases) with high accuracy.
  3. Applications:

    • Titration: Burettes play a crucial role in titration, a method used to determine the concentration of an unknown solution (analyte) by reacting it with a known solution (titrant).
      • During titration, the known solution (titrant) is added from the burette to the analyte until the reaction is complete.
      • An indicator signals the endpoint, which is the point of complete neutralization (e.g., acid-base titration).
      • The color change of the indicator determines the endpoint.
    • Quantitative Analysis: Burettes are essential for precise fluid dispensing during quantitative analyses.
    • Gas Burettes: These are filled with a fluid (e.g., water, oil, or mercury) and measure gas displacement.
  4. Types of Burettes:

    • Volumetric Burette:
      • Features a volume scale printed on the burette wall.
      • Contains a stopcock at the end for liquid flow control.
      • Can be made of glass or plastic.
      • Used for both liquid and gas measurements.
    • Digital Electronic Burette: Utilizes electronic sensors for accurate measurements.
    • Piston Burette:
      • Similar to syringes but with a precision bore and plunger.
      • Delivers measured volumes of liquid.

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