Molar mass of B =?
Conc(molldm³)= Conc(gldm³)/molar mass
0.042/1 * 4.20/m.m
Value of x in x²(i)³=?
(2x)+12 + (16*3)= 100
(i)I ensure that the readings are taken at the lower meniscus
(ii)I ensure that my saliva did not enter the pipette while taking the base
An effervescence occurs in which a colorless and odourless gas which burns blue litmus red is evolved.
CO² gas from CO3^²is suspected
The gas turns lime water milky.
CO² gas is confirmed.
Y dissolves completely in water
White gelatinous PPT is formed.
Al³+, Zn²+, Pb²+, present
The white gelatinous PPT dissolve in excess NaOH
Al³+, Zn²+, Pb²+, present
White gelatinous PPT formed.
Al³+, Zn²+, Pb²+, present
The white gelatinous PPT remain insoluble in excess NH³
Al³+, Pb²+, present.
It increases the boiling point of water
It requires heat to occur.
This is because it is deliquescent.
I. Calcium oxide
II. Anhydrous copper(ii) tetraoxosulphate(vi)
I. To separate a mixture of immiscible liquids
II. To collect gases.
For question 1
Use your school’s endpoint and use it wherever you see our endpoint (13.20cm³) …and calculate with it.
Use the answer you got in 1b(i) to solve in 1b(ii) i.e we got 0.0396 in 1bi after calculating with our average titre (endpoint) value 0.0396, as u can see, we then used the 0.0396 in 1bii which we got from our calculation in 1bi.
*NB:* If you use our endpoint and your school teacher submits a different one with a wide margin to what u used, you will either fail or lose some mark in this particular question. Your school teacher should have in one way given you the average titre value(endpoint) or you might have gotten it in the lab from your past experiment.
If your school wants to use mine, then the chemistry teacher must submit endpoint similar to ours without much difference…eg 13.10, 13.20, 13.30, etc
The National Examinations Council, confirmed 2022 NECO Chemistry Practical question and answer for this year (2022) is live here on Expospy.com.ng, the best exam portal of all time.
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As extracted from the 2022 timetable, NECO Chemistry Practical will be held Wednesday, 20/07/2022.
Here is the schedule of all exams scheduled for the day.
Wednesday 20th July 2022
Chemistry (Practical) – 10:00am – 12:00pm
Table of Contents
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NECO Chemistry Practical Specimen 2022
INSTRUCTION(S) TO SCHOOL
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;
(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.
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