CHM 2354 Lecture Notes - Lecture 2: Volumetric Flask, Gravimetric Analysis, Filter Paper

• School: University of Ottawa
• Department: Chemistry
• Course: CHM 2354
• Professor: Maxim Berezovski

Document Summary

Chm 2354 lecture 2 good laboratory practices; equipment + error. Weight: the weight of an object = the force of gravity felt by an object, w = m x fg. Electronic opposing electromagnetic force: tare the mass of an empty vessel, methods of weighing, basic operational rules. Chemicals should never be placed directly on the weighing pan corrode and damage the pan may affect accuracy not able to recover all of the sample. Balance should be in arrested position when load/unload pan. Half-arrested position when dialing weights dull knife edge and decrease balance sensitivity accuracy (ii) weight by difference: (iii) taring: Useful for samples that change weight upon exposure to the atmosphere hygroscopic samples (readily absorb water from the air) will get heavier as they absorb it. Weight of sample = (weight of sample + weight of container) weight of container. Container is set on balance before sample is added.