Why is Weighing Liquids More Accurate than Measuring w/Cylinder?

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SUMMARY

Weighing liquids is often more accurate than measuring with a graduated cylinder due to the precision of analytical balances compared to human judgment. The accuracy of the balance, which can measure to 0.01 mg or better, significantly enhances the reliability of the measurement. Additionally, calculating the volume of a liquid based on its density after weighing it in clean glassware further increases accuracy. This method assumes that the glassware is properly cleaned before use.

PREREQUISITES
  • Understanding of analytical balances and their specifications
  • Knowledge of liquid density calculations
  • Familiarity with proper laboratory glassware handling
  • Basic principles of mass and volume measurement
NEXT STEPS
  • Research the specifications and calibration of analytical balances
  • Learn about calculating liquid density and its applications
  • Study best practices for cleaning and preparing laboratory glassware
  • Explore the differences between volumetric and gravimetric measurement techniques
USEFUL FOR

Laboratory technicians, chemists, and anyone involved in precise liquid measurement and analysis will benefit from this discussion.

mousesgr
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i want to know
Why sometimes is it more accurate to weigh liquids than to use a graduated cylinder to measure them??
 
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It has to do with the accuracy of the balance you use...it is most likely that the balance you use is more accurate than human judgement is at eyeing an exact volume.
 
Also, densities of liquids are calulated with much accuracy as well. So weighing a liquid increases overall accuracy...assuming your glassware is clean.
 
Yes, this is correct. If you first weigh a clean and empty glassware and zero it while it is on the balance, and then add a required amount of liquid (considering its density), you can calculate its volume. Some analytical balances can weigh accurately to 0.01 mg, and even more.
 

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