11th Chemistry Experiment No.1 Answers [Science] ~ Introduction to apparatus used in Chemistry laboratory

11th chemistry practical book answers pdf Maharashtra board 

~ Introduction to apparatus used in Chemistry laboratory

Questions

1. Why it is necessary to rinse the pipette after washing with water?​

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.

2.What will happen if we do not remove the air bubble from nozzle of burette?

If we do not remove the air bubble from the nozzle of burette errors will be occurring in a titration. Titration is an analytical method. It is used to find the unknown values of the solution. If we want to perform an experiment optimally burette should be cleaned properly.

3.What is the simple method of getting a correct reading of burette​?

When the liquid is filled inside the burette, the uppermost layer of that liquid forms a concave surface and for getting a correct reading we should measure the lower tip of that concave upper surface and we should avoid the upper surface of that concave ,in order to avoid measurement mistakes..

4.Why it is necessary to rinse the burette after washing with water?

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 burette.

5.Always take the zero mark of lower meniscus as the starting point for every titration. Give reason​.

While titration, the zero mark of the lower meniscus is considered as the starting point because water droplets tend to attach to the walls of the side of the glass cylinder. But this stickiness is not found to occur in the middle because of which straight level of water can not be noted.

A meniscus can be referred to as the curvature that is seen or noted on the water surface.

Courtesy:

https://brainly.in/question/12483045#:~:text=Answer%3A,water%20can%20not%20be%20noted.

https://brainly.in/question/12659619#:~:text=K%20people%20helped-,Answer%3A,order%20to%20avoid%20measurement%20mistakes.

https://brainly.in/question/13724295#:~:text=Expert%2Dverified%20answer,-question&text=If%20we%20do%20not%20remove%20the%20air%20bubble%20from%20the,be%20occurring%20in%20a%20titration.&text=Titration%20is%20an%20analytical%20method,unknown%20values%20of%20the%20solution.&text=If%20we%20want%20to%20perform,buret%20should%20be%20cleaned%20properly.

https://brainly.in/question/12420802#:~:text=This%20water%20can%20act%20as,residual%20water%20of%20the%20pipette.

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