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Volumetric Instruments quiz

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  • What is the primary use of a transfer pipette in the laboratory?
    A transfer pipette is used to transfer small amounts of liquid, typically made from basic plastic.
  • How does a burette help in acid-base titrations?
    A burette allows precise measurement and delivery of liquid titrant during acid-base titrations.
  • What is the function of a Buckner funnel in laboratory filtration?
    A Buckner funnel is used with filter paper to separate solids from liquids during filtration, often aided by a vacuum flask.
  • Why is a graduated cylinder considered less precise than other volumetric instruments?
    A graduated cylinder measures volume but is less precise, making it suitable for transferring larger quantities without needing exact accuracy.
  • What is the main purpose of a volumetric flask?
    A volumetric flask is used for precise dilutions, allowing accurate dilution of solutions up to a marked volume.
  • For what task is an Erlenmeyer flask typically used?
    An Erlenmeyer flask is used for transferring and mixing large amounts of solutions.
  • What is a crucible used for in the chemistry laboratory?
    A crucible is used to heat small amounts of solid material to high temperatures, often to drive off water and obtain an anhydrous sample.
  • How does an evaporating dish function in the lab?
    An evaporating dish facilitates the evaporation of liquids, leaving behind solid residues.
  • What is the difference between a spatula and a scoopula?
    A spatula is used to transfer small amounts of powdered solid, while a scoopula is used for larger amounts.
  • What is the primary use of a separatory funnel?
    A separatory funnel is used for liquid-solid separation and acid-base extractions, aiding in partitioning processes.
  • How does a vacuum flask assist in filtration?
    A vacuum flask, when connected to a Buckner funnel, uses suction to speed up the filtration process.
  • What is the purpose of filter paper in a funnel during filtration?
    Filter paper separates the liquid (filtrate) from the solid (residue) when placed in a funnel.
  • What is meant by a substance being 'anhydrous' after heating in a crucible?
    Anhydrous means the substance is completely dry, with all water removed after heating.
  • How is a regular funnel used differently from a Buckner funnel?
    A regular funnel is used for simple filtration or transferring liquids/solids into containers with small openings, while a Buckner funnel is used for vacuum filtration.
  • What is partitioning in the context of a separatory funnel?
    Partitioning refers to the separation of a solid from a liquid by exposing the solid to another solvent, often used in acid-base extractions.