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Questions and Answers
Which of the following is true about the volume indicated on a pipette inscription?
Which of the following is true about the volume indicated on a pipette inscription?
- The volume is always stated in liters.
- The volume is stated in milliliters. (correct)
- The volume is stated in centimeters.
- The volume is stated in grams.
Which of the following is indicated by the inscription '10 ml in 1/10' on a pipette?
Which of the following is indicated by the inscription '10 ml in 1/10' on a pipette?
- The pipette is graduated in 1/10 ml increments.
- The pipette can measure up to 1/10 ml.
- The pipette is graduated in 10 ml increments.
- The pipette can measure up to 10 ml. (correct)
Which of the following is the purpose of the inscriptions 'T.D.' or 'T.C.' on a pipette?
Which of the following is the purpose of the inscriptions 'T.D.' or 'T.C.' on a pipette?
- To indicate the measurement units of the pipette.
- To indicate the volume of the pipette.
- To indicate the type of liquid that can be measured.
- To indicate whether the pipette is 'To Deliver' or 'To Contain'. (correct)
What is the difference between a 'To Deliver' (TD) and a 'To Contain' (TC) pipette?
What is the difference between a 'To Deliver' (TD) and a 'To Contain' (TC) pipette?
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What can happen when a pipette is used to measure a viscous fluid?
What can happen when a pipette is used to measure a viscous fluid?
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Study Notes
Pipette Volume Inscription
- The volume indicated on a pipette refers to the amount of liquid it can deliver or contain based on design specifications.
- A pipette marked '10 ml in 1/10' indicates that it can accurately deliver 10 milliliters of liquid when fully filled to the mark.
Purpose of 'T.D.' and 'T.C.' Inscriptions
- 'T.D.' stands for "To Deliver," indicating that the pipette is calibrated to dispense the specified volume of liquid.
- 'T.C.' stands for "To Contain," meaning the pipette is designed to hold the specified volume, but not all of it may be delivered when pouring out.
Difference between TD and TC Pipettes
- A 'To Deliver' (TD) pipette is intended for delivering a precise volume, ensuring that the entire amount is dispensed.
- A 'To Contain' (TC) pipette holds a specific volume but retains some liquid within due to surface tension, leading to slight inaccuracies when transferring the entire contents.
Effects of Using a Pipette for Viscous Fluids
- Using a pipette to measure viscous fluids can lead to inaccurate measurements since thick liquids may not flow freely or completely out of the pipette.
- Possible clogs or slow drainage may affect the delivery rate, making it difficult to obtain the intended volume efficiently.
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