Volumetric Analysis: Oxidation-Reduction (LC 2027) (Leaving Cert Chemistry): Flashcards
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Practise the cards
13 cards from this deck
Experimental error definition
Experimental error definition
Difference between measured and true value
Two main categories of experimental error
Two main categories of experimental error
Systematic error and random error
Systematic error definition
Systematic error definition
Consistent repeating error in same direction
Direction of systematic error measurements
Direction of systematic error measurements
Always higher OR always lower than true value
Does systematic error affect accuracy or precision?
Does systematic error affect accuracy or precision?
Accuracy
Can systematic errors be completely eliminated?
Can systematic errors be completely eliminated?
Yes
Parallax error
Parallax error
Systematic error from reading meniscus at wrong angle
Random error definition
Random error definition
Unpredictable fluctuation in measurements
Direction of random error measurements
Direction of random error measurements
Unpredictable - can be higher or lower than true value
Does random error affect accuracy or precision?
Does random error affect accuracy or precision?
Precision
Can random errors be completely eliminated?
Can random errors be completely eliminated?
No, only minimised
Key method to minimise systematic errors
Key method to minimise systematic errors
Proper calibration and correct procedures
Key method to minimise random errors
Key method to minimise random errors
Take multiple measurements and calculate average