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Under: [14/07, 10:38] CODEDBOSS: 2021 NECO CHEMISTRY-PRACTICAL
INSTRUCTIONS 👇👇👇
TAKE NOTE ON THIS NUMBER 1
“`Pls note that each school have their titre value or end point. In our solution, we used 21.40cm3.
So make sure you use ur school’s titre value.
Ask your chemistry teacher. Some school got 24.50, 24.20, 22.10, 22.40, etc.
Make sure your average titre value tallies with that of ur school’s. Anywhere you see 20.40 in my work, edit it and re-solve with ur school’s value.“`
The Chemistry Practical Comprises 3 Questions from Volumetric or Titrimetric Analysis And General Questions. You are to Attempt all Questions.
Make sure you use your school Average Titration Values in other to get Accurate Solutions with your Lab. Attendant Report.
NUMBER 1 STEP 3 VOLUME OF THE A USED IS THE LAST POINT, AND EACH SCHOOL HAS HIS LAST POINT ,SO ASK YOUR CHEMISTRY TEACHER FOR THE LAST POINT AND THEN CALCULATE YOUR AVERAGE VOLUME OF ACID USED
This is very important.
Best wishes💪💪💪
[14/07, 10:38] CODEDBOSS: (1aii)
This is because it is a reaction between a weak acid and strong base
(1aiii)
A funnel should be used while transferring the acid into the burette.
(1bi)
Conc of A in mol|dm³ =?
Conc of A in g|dm³ = 12.75g|dm³
Molar mass of A, NaHSO⁴ = 23+1+32+64
=120g|dm³
From.
Conc(mol/dm³) = conc(g/dm³)/molar mass
Conc =12.75/120
Conc =0.106mol/dm³
(1bii)
Con of B in mol/dm³ =?
Ca =0.106, Cb =? Va =23.50cm³, Vb =25.00cm³
na=1 , nb=1
From; CaVa/CbVb=na/nb
Cb=CaVanb/Vbna
Cb=0.10623501/25.001
Cb=2.5/25
Cb=0.1mol/dm³
(1biii)
Conc of B in g/dm³=?
Molar mass of B , NaOH=23+16+1=40g/mol
From; conc(g/dm³)=conc(mol/dm³)molar mass =0.140
=4.0g/dm³
(1biv)
Mass of salt formed =?
Recall mole of NaHSO⁴=?
From; mole =con(mol/dm³)*vol(cm³)/1000
Mole=0.106*23.50/1000
Mole=0.0025mol of NaHSO⁴
By proportion 1mol of NaHSO⁴ produce 1mol of Na²SO⁴ 0.0025mol of NaHSO⁴ will produce X mol of Na²SO⁴ X=0.00251=0.0025mol of NaSO⁴ Molar mass of Na²SO⁴=(232) + 32 + (16*4)
=46+32+64
=142g/mol
Recall; mole =mole/molar mass
Mass =mole * molar mass
Mass =0.0025*142
Mass =0.36g of Na²SO⁴
(2a)
TEST
C + 5cm³ of distilled water
OBSERVATION
It dissolve completely
INTERFERENCE
C is a soluble salt
(2bi)
TEST
Solution + NaOH + Heat
OBSERVATION
Effervescence occurs in which a colourless gas with pungent smell and turns red litmus paper to blue is given off.
INFERENCES
NH³ gas from NH⁴+ is present
(2bii)
TEST
Stirring rod of HCL + gas given off
OBSERVATION
a gas which gives a pop sound is given off
INFERENCES
H² is present
(2ci)
TEST
Solution C + drops of BaCL²
OBSERVATION
a white precipitate is formed
INFERENCES
CO²^-3, SO²^-4, SO²^-3, May be present.
(2cii)
TEST
Solution in C(i) + dil HCL
OBSERVATION
the white precipitate dissolve is dil HCL and effervescence occurs in which a colourless and odourless gas which turns blue litmus red and lime water milky is given off
INTERFERENCE
CO² gas from CO²^3- confirmed
(3a)
(i)Ca²+
(ii)Pb²+
(3bi)
concentrated acid can be defined as an acid formed when a large quantity of an acid dissolve in a small or little volume of water.
(3bii)
A strong acid is defined as a type of acid that ionize completely in a solution
(3c)
Activated charcoal is used as an adsorbent material
(3d)
(i)Reddish – Brown
(ii) I – red, II – brown.
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