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Why is it important to rinse the burette with the solution to be used in titration?
When you’re cleaning your glassware, you use water to rinse it off. If the burette is not completely dry by the time you use it, the remaining traces of water on the inside will make your titrant more dilute and thereby change its concentration.
Why it is necessary to rinse the pipette after washing with water answer?
This water can act as a contaminant to the solution while titration, so rinsing and re-rinsing are done with the solution it is going to be filled with, is done so that no water is left in the pipette. Thus, rinsing is done to get rid of the residual water of the pipette.
Why is it important to rinse the buret with sodium hydroxide solution and not just water )?
Why? When rinsing a buret, the water and rinse should go through the tip. The reason you rinse with sodium hydroxide is because whenever you clean, a small amount of water remains in the buret and it must be cleansed before the experiment begins, or it may alter the values– especially since NaOH is very hygroscopic.
Why is it important to clean laboratory glassware before use?
Titration » Volumetric glass cleaning Laboratory glassware have to be perfectly clean before it can be used for any type of analytical work. There are two reasons for that. First, you don’t want any remaining reagents on the glass surface – they could react with your solutions and change analysis results.
Why does glass have to be clean for volumetric spectroscopy?
It is impossible to account for volume of these droplets, so you will never know what volume of the reagent was used – and as the precision of the volume measurements is the basis of the precision of the volumetric methods, dirty volumetric glass means huge errors. That’s not what we want, thus glass has to be clean.
What is the effect of Dirty volumetric glass on volume measurements?
Droplets of the reagent solution on the surface of the greasy glass. It is impossible to account for volume of these droplets, so you will never know what volume of the reagent was used – and as the precision of the volume measurements is the basis of the precision of the volumetric methods, dirty volumetric glass means huge errors.
What happens when you rinse a burette after titration?
Yet you are in a titration trying to determine concentrations with great precision, 4 significant figures or so. If you rinse the burette with the solution to be used, then any tiny amounts of liquid remaining are the same as the solution used to fill the burette, so they will not change the concentration of the solution in any way.