Jawapan

2016-07-20T14:49:53+08:00
You want to measure a volume of solvent to dissolve a solid? 
•A GRADUATED CYLINDER will be OK. 
•In such cases, where the volume is only approximate, then even the markings on the beaker or CONICAL FLASK may be fine. 

You want to make up a solution of known concentration? 
•dissolve the solute in a small volume of solvent, transfer quantitatively to a VOLUMETRIC FLASK and make up to the mark. NB: also for dilutions. 
•If you are preparing to do a titration, you will use a PIPETTE to transfer a sample of the solution. 
•The titrant will be delivered from a burette. 

Additional info regarding accuracy/precision: 
•Pipettes (20, 25 mL) ±0.03 mL 
•Burette (50 mL) ±0.05 mL 
•Volumetric flask (50 mL) ±0.05 mL 
•Volumetric flask (100 mL) ±0.08 mL 
•Volumetric flask (250 mL) ±0.12 mL 
•Volumetric flask (500 mL) ±0.20 mL
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