The Student Room Group
Reply 1
To calculate percentage error you need:

(Error x 100)/Actual Reading

The error is the plus of minus value for a piece of equipment. The burette will typically be plus or minus 1ml. The glassware will depend on the grade of it.

So for your burette, multiply the 0.1ml by 100 and then divide that by the reading you are suing for your titre. Remember though, you are taking two readings from the burette, one from the beginning of the titration and one at the end which means that there are 2 places where your value could be plus or minus that 0.1ml.

Don't quote me on the 0.1ml error though, you need to find out what it is for your equipment.

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