required practical 1

Question 1

what is the purpose of titrations

Answer 1

Titrations are done often to find out the concentration of one
substance by reacting it with another substance of known
concentration

Question 2

why do we use a conical flask instead of a beaker

Answer 2

A conical flask is used in preference to a beaker because
it is easier to swirl the mixture in a conical flask without
spilling the contents.

Question 3

why is it important burette is rinsed out

Answer 3

If it is not rinsed out the acid or alkali added may be
diluted by residual water in the burette or may react with
substances left from a previous titration. This would lead to
the concentration of the substance being lowered and a larger
titre being delivered.

Question 4

why do you not leave the funnel in the burette

Answer 4

Don’t leave the funnel in the burette because small drops of
liquid may fall from the funnel during the titration leading to a
false burette reading

Question 5

to find uncertainty

Answer 5

uncertainty divided by mean titre or result from apparatus