(a)[1]
During step 1, the student measures $25\,\text{cm}^3$ of aqueous sodium hydroxide into the conical flask with a measuring cylinder. State how the accuracy of step 1 could be improved.
(b)[3]
Describe what the student carries out in step 2 of the procedure. Name apparatus A and solution B.
(c)[1]
Identify what is placed in the flask in step 3 before the titration begins.
(d)[1]
In step 4, the student continues adding solution B to the aqueous sodium hydroxide in the conical flask until the end-point is reached. State how the student recognises that the end-point has been reached.
(e(i))[1]
State why the substance added in step 3 of the first titration is not introduced.
(e(ii))[3]
Describe how the student obtains pure sodium chloride crystals from the solution in the conical flask.