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

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Discussion Overview

The discussion revolves around the comparative accuracy of weighing liquids versus measuring them with a graduated cylinder. It explores the implications of measurement techniques in experimental contexts.

Discussion Character

  • Technical explanation, Conceptual clarification

Main Points Raised

  • One participant suggests that the accuracy of the balance used for weighing liquids is generally higher than the accuracy of human judgment when estimating volume with a graduated cylinder.
  • Another participant notes that the precise calculation of liquid densities contributes to the overall accuracy when weighing liquids, provided that the glassware is clean.
  • A further contribution emphasizes the method of weighing an empty container, zeroing the balance, and then adding the liquid to determine its volume based on density, highlighting the precision of analytical balances.

Areas of Agreement / Disagreement

Participants appear to agree on the notion that weighing liquids can be more accurate than measuring with a graduated cylinder, though the discussion does not resolve all aspects of the comparison.

Contextual Notes

Assumptions regarding the cleanliness of glassware and the precision of the balance are noted, but not resolved. The discussion does not address potential limitations of graduated cylinders or specific scenarios where one method may be preferred over the other.

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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