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Acids and Alkalis

Titration - Using a Burette and a Pipette.

A burette is a long glass tube with a tap at the bottom.
The tap can be turned open allowing acid in the tube
to be added drop by drop to a conical flask.
The burette has graduation marks along it
which give the total volume of the acid at that point.
The marks may be 2cm³ apart with smaller marks within them
giving a reading of the volume which is accurate to 0·2cm³.

If the total volume of acid is 100cm³ to begin with
and 54·7cm³ after neutralisation, then the amount of acid used
is 100 - 54·7  = 45·3cm³

The pipette is used to place an accurate amount of alkali
into the conical flask before the titration begins.
The pipette has a filling line marked on it
which precisely gives the volume at that point.
The alkali is sucked up into the pipette until the volume reaches this line.
Never use your mouth to suck up alkali or any other substance
into the pipette - always use a pipette filler.

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