Question about Experimentally Measuring Mass

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    Mass Measuring
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Measuring the mass of NaCl in its container before measuring the empty container's mass is crucial for accurate results. This method ensures that any residue left in the container does not affect the measurement of the NaCl's mass. If the NaCl is to be transferred to another container, measuring the container first allows for a straightforward calculation of the NaCl's mass by subtracting the container's mass from the total. However, if the NaCl remains in the original container, measuring the container's mass first would be necessary to avoid including any residue in the final measurement. This approach emphasizes the importance of measurement order in achieving precise results in experiments.
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In an experiment that I conducted, I was instructed to measure the mass of a substance (NaCl) in it's container BEFORE measuring the mass of just the container.

Is there a logical reason behind doing it in this order rather than measuring the mass of the container FIRST AND THEN measuring the mass of the container + NaCl?
 
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The only circumstance in which you can do is is if you then to transfer the NaCl to some other container.
When you make the second measurement you are not only measuring the mass of the container you are including the mass of any residue left behind.

That way your difference of masses will truly be the amount of NACl used.

If you were going to keep the NaCl in the container you would have to do the measurement the other way round.

go well
 

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