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There are a bunch of things that can cause a stopcock to leak. There are 2 common types:
Ground glass stopcocks can leak without proper application of stopcock grease either too much or not enough. It may also have dirty grease or glass. Clean it all off with acetone and reapply a very thin coating of high vacuum grease. The glass stopcock needs to be set in the housing with sufficient pressure to stop leaking. Turn it numerous times while seating the cock. There are various methods for holding the cock in place.
Tefflon (plastic) & glass stopcocks should be cleaned with acetone when they are new. Do not use grease of any kind. Make sure that there is no dirt or particles between moving parts…it will scratch the plastic and crate a channel (the plastic part will have to be replaced if scratched). Assemble the stopcock properly. The rubber O-ring should be between the nut and the plastic washer. The plastic washer should be against the glass. Tighten the nut to create sufficient pressure between the glass housing and the cock to stop any leaking. It should still be able to turn easily.
Rinse glassware after use and store stopcocks in the open position.
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Why is it important to clamp the burette vertically?
To ensure that the actual volume of liquid delivered into the conical flask is read accurately
How do you clean pipette?
First remove all the solid particles from the burette using a scrubber. Then wash the burette with tap water followed by distilled water thoroughly (even the nozzle). Then wash the burette with the solution to be used in the burette.
What is a burette?
A burette is a glass tube with fine gradations and a stopcock at the bottom, used in laboratory procedures for accurate fluid dispensing and titration.
What is the zero reading of a vernier caliper?
on the very top of the burette. Should start from zero to 100mL on the burette
Why is it important to clean a burette?
It is important to remove the filter funnel before adjusting the level of the burette so as to prevent the residual drops of the reagent from dripping into the burette. Which can lead to inaccurate volume readings.
What is the precaution steps for titration?
Ensure the burette is vertical Titrate slowly when reaching the end point
Why is it important to clamp the burette vertically?
To ensure that the actual volume of liquid delivered into the conical flask is read accurately
How do you ensure refrigerant gas does not leak from window air conditioner?
There is nothing you can do to prevent a leak from occurring.
Is a burette the best tool to measure acid?
Yes, a burette is the best tool for measuring acidYes, a burette is the best tool for measuring acid
What instruments holds the burette?
A ring clamp is used to hold a burette.
What is Relative standard uncertainty in burette?
The smallest possible burette reading is 0.10 and the uncertainty of a burette's reading is half of its smallest value (0.05).
What is the pupose of a burette?
A burette is used to very accurately measure liquid volumes.
Which is most accurate burette beaker measuring cylinder and volumetric flask?
burette
How do you clean pipette?
First remove all the solid particles from the burette using a scrubber. Then wash the burette with tap water followed by distilled water thoroughly (even the nozzle). Then wash the burette with the solution to be used in the burette.
What is is the use of burette holder in chemistry lab?
In analytical chemistry so many experiments are to be carried out to analyse the chemical properties of solutions/substances. The accuracy of analysis depend on the accuracy of iteration. An accurate reading is possible when it is fixed at perfect vertical position. In order to hold burette in a perfect vertical position during experiment a clamp must be used.
Which apparatus would you use to measure a 25 cm cube liquid?
Burette
What is an acid burette?
If you have an acid in your conical flask then the base will go into the burette. The burette is used to measure the amounts of base you are adding and therefore you will be able to determine the end point which is normally determined by a colour change.
