Equations

Question 1

Why should the burette and pipette be washed out with their solutions before being used in the experiment

Answer 1

Washing removes any chemicals that may have been left behind from another experiment (1)

Which might react with substances in the experiment (1)
Producing anomalous results (1)

Question 2

What is the purpose of performing a rough titration

Answer 2

To determine the approximate value of the end point (1)
To save time by not having to add the reagent dropwise from the beginning (1)
The rough titration overshoots the end point and so i not normally used (1)

Question 3

Explain why universal indicator shouldn’t be used in titration

Answer 3

A sharp colour change is needed to correctly indicate the end point (1)

Universal indicator contains a mixture of indicators so the colour change will not be sharp enough (1)