B) Explain how a burette and a conical flask should be rinsed before a titration experiment?

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. This is to prevent contamination.

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air

in a tire you fill a tire with air

then a couple days later you check the air pressure in the tire

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