Neco Chemistry Practical Answers 2022 for 20th July 2022 with questions 100% verified official questions and answers for senior secondary schools.
NECO CHEMISTRY PRACTICAL ANSWERS 2022
Titration; | rough | 1 | 2 | 3 |
Final; | 20.50 | 14.00 |14.00 | 14.00 |
Initial; | 0.00 | 0.00 | 0.00 | 0.00 |
Volume of A used; | 20.50 | 14.00 |14.00 | 14.00 |
Volume of pipette used
Average volume of A used = 14.00+14.00+14.00/3
2HNO³ + X²CO³ —> 2XNO³ + H²O + CO²
Conc – of B in molldm³ = ?
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.
Teacher’s Report filling
1: A=0.15, B= 4.20
2 (i=14.00, ii=14.00, iii=14.00)
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
CHEMISTRY PRACTICAL SPECIMENS
INSTRUCTION(S) TO SCHOOL
In addition to the apparatus and reagents to be available in a secondary school chemistry laboratory, each candidate will require the following:
(a) One burette (50cm³)
(b) One pipette (20cm³/25cm³), however all candidates in a center must use pipettes 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
Each candidates should be supplied with the following, labelled An, Bn, Xn and Yn; where ‘n’ is the candidate’s serial number.
* 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.
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Neco Chemistry Practical Answers 2022
Wednesday 20th July 2022
- Paper I: Practical – Chemistry – 10:00am – 12:00pm
Neco 2022 Chemistry Practical Questions and Answers
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