INSTRUCTION(S) TO SCHOOL FOR NECO 2022 CHEMISTRY PRACTICAL SPECIMEN
Great care should be taken to ensure that the information given below does not reach the candidates either directly or indirectly before the examination.
In addition to the apparatus and reagents expected to be available in a Secondary School Chemistry Laboratory, each candidates will require the following for Neco 2022 Chemistry Practical Specimen;
(a) One Burette (50cm3).
(b) One Pipette (20cm3/25cm3), however all candidates in a centre must use pipette of the same volume.
(c) The usual apparatus and reagents for qualitative work including;
(i) Dilute Sodium Hydroxide Solution.
(ii) Dilute Ammonia Solution.
(iii) Dilute Hydrochloric Acid.
(iv) Distilled Water.
(v) Red and Blue Litmus Paper.
(vi) Barium Chloride Solution.
(viii) Calcium Hydroxide Solution.
(ix) Methyl Orange.
(x) One Boiling Tube.
(xi) Five Test Tubes.
(xii) Filtration Apparatus.
(xiii) Source of Heat.
3. Each candidates should be supplied with the following labeled An, Bn, Xn and Yn; where ‘n’ is the candidate’s serial number.
(a) 150cm3 of trioxonitrate(v)acid solution in a bottle labelled “An”. The acid solution which should be the same for all candidates will contain 9.50cm3 of concentrated trioxonitrate(v)acid per dm3 of solution.
(b) 150cm3 of sodium(iv) solution in a bottle lableled “Bn”. The solution which should be the same for all candidates will contain 4.20g of sodium trioxocabonate(iv) per dm3 of the solution.
(c) One Spatulaful of Zinc(II)trioxocabonate(iv) salt in a specimen bottle labelled “Xn”.
(d) One Spatulaful of Aluminium chloride salt in a specimen bottle labelled “Yn”.
4. In all cases, more materials may be given if required.
5. The actual concentrations of An and Bn must be stated by the Subject Teacher’s report form, while the candidates should make use of the concentrations stated in the question paper.