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What is the source of error for the lab concerning the law of conservation of mass?

smartcookie

wrote...

11 years ago

What is the source of error for the lab concerning the law of conservation of mass?

this is for a lab of proving whether or not the law of conservation of mass exists with this formula 2KI + Pb(NO3)2 ? 2KNO3 + PbI2
This lab includes the forumula 2KI + Pb(NO3)2 ? 2KNO3 + PbI2 and the materials have been heated. Also, it is to be performed to figure out whether it supports the law of conservation of mass.

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nsmcatnow

wrote...

#1

11 years ago

if there was any heating involved, you may have lost product or still had some liquid in the precipitate when you weighed it..

smartgirl

wrote...

#2

11 years ago

vaporization of liquids, oxidation - reduction of O2 and CO2... cheap equipments, bad laboratory skill (never mention this), temperature, unstable mass balace, heat vapor while measuring... etc.... we can never be 100% efficient bc we do not live in a vacuum..

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