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Kael needs to transfer exactly 25.0 cm^3 of hydrochloric acid into a conical flask for an experiment of neutralisation. What is the best piece of apparatus to use?

Answer 1

A #25*mL# volumetric pipette, made out of glass.

See this site. A range of pipettes are listed. The pipette you would use is a volumetric pipette, which come in several sizes, i.e. #1*mL#, #10*mL#, #25*mL#, etc., that is calibrated to deliver the required volume (note that #1*cm^3-=1*mL#) within a specified range.

Get your demonstrator to demonstrate correct technique; he or she may be a stickler for detail, so it could be humorous. These are precision instruments that require some practice and care to use (and they are fragile, of course!).

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Answer 2

Xavier Avery

A graduated cylinder or a burette would be suitable for accurately transferring 25.0 cm^3 of hydrochloric acid.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.