Care and Use of Analytical Balance Quiz
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Questions and Answers

How should objects to be weighed be handled according to the text?

  • By placing them directly on the balance pan
  • By washing them thoroughly before weighing
  • With care and avoiding direct contact with chemicals (correct)
  • With gloves to prevent contamination
  • What should never be exceeded when using an analytical balance?

  • Liquid capacity
  • Maximum load (correct)
  • Chemical weight
  • Dust limit
  • What is the purpose of a centrifuge chamber as described in the text?

  • Measuring liquid volumes accurately
  • Separating particles from a solution based on shape and size (correct)
  • Balancing weights in a container
  • Reducing dust in the laboratory environment
  • What is one key advantage of using electronic balances compared to mechanical balances?

    <p>Freedom from mechanical failure</p> Signup and view all the answers

    How does an autoclave operate according to the text?

    <p>By using steam pressure as a sterilizing agent</p> Signup and view all the answers

    Why is it important to keep a balance clean according to the text?

    <p>To avoid interference with weight measurements</p> Signup and view all the answers

    What is the main component of an autoclave?

    <p>Boiler</p> Signup and view all the answers

    What is the purpose of the wire basket in an autoclave?

    <p>To hold the material to be sterilized</p> Signup and view all the answers

    What does TOT stand for in the context of sterilization?

    <p>Thermal Death Time</p> Signup and view all the answers

    How does increasing the temperature affect the Thermal Death Time (TOT)?

    <p>Decreases TOT</p> Signup and view all the answers

    What is the role of the Basket Support in an autoclave?

    <p>Hold the basket above the water level</p> Signup and view all the answers

    Who designed the gas analyzer known as the Clark Cell?

    <p>Platinum Chloride</p> Signup and view all the answers

    Study Notes

    Analytical Balance

    • Never exceed the maximum load capacity of the balance
    • Keep the balance clean and free from dust
    • Objects to be weighed should not be handled with bare hands
    • Chemical objects should not be placed directly on the pan, and liquids should be in a closed vessel or bottle

    Centrifuge Chambers

    • Used for separating particles from a solution based on shape, density, and size
    • Each chamber has a double pom analytical balance

    Single Pan Analytical Balance

    • Uses a standard procedure of putting a counter weight on an immovable horizontal path
    • Provides a convenient way of measuring weight

    Electronic Balance

    • Two types: load type and electromagnetic type
    • Provides convenience and freedom from mechanical failure
    • Reduces sensitivity and provides high accuracy

    Autoclave

    • Uses high-pressure steam to sterilize equipment
    • Operates by using steam to reach high temperatures, killing microorganisms
    • Time required to kill microorganisms is referred to as thermal death time (TOT)
    • Autoclave operates on a time-temperature relationship, where increasing temperature decreases TOT
    • Components of an autoclave include a boiler, wire basket, and basket support

    Blood PO₂ Measurement

    • Measures the partial pressure of oxygen in blood
    • Uses a polarographic method with a platinum electrode
    • Operates by reducing oxygen in the blood, which generates a voltage signal
    • Voltage range observed is between 0.6 and 10 polarization voltage
    • Designed by Clark, a scientist

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    Description

    Test your knowledge on the care and use of an analytical balance. Questions cover topics such as maximum load, cleanliness, handling of objects, and proper storage of materials.

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