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NECO Chemistry practical 2023
NECO 2023 CHEMISTRY ANSWERS FROM joberplanet.com
Burette Reading (cm³) | Rough | Titration I | Titration II
Final Reading (cm³) | 21.50 | 43.00 | 22.00
Initial Reading (cm³) | 0.00 | 21.50 | 00.00
Volume of A used (cm³) | 21.50 | 21.50 | 22.00
Average Volume of acid used = 21.50 + 21.50/2 = 21.50cm³
Solution B[Sodium trioxocarbonate (iv)] feels soapy
Conc. B in mol/dm³ =?
Ca= 0.04, Va= 21.50cm³, na= 1
Cb= ? , Vb= 25.00cm³ nb= 1
CaVa/CbVb = na/nb = 0.04×21.50/Cb×25.00 = 1/1
Cb= 0.04×21.50/25.00 = 0.86/25.00
Conc. of B in g/dm³ = Conc. of B in mol/dm³ × molar mass of B
Molar mass of B(NaCO₃)= (23×2) + 12 + (16×3) = 106
:. Conc. of B in g/dm³ = 0.0344×106 = 3.6g/dm³
1 mole of Na₂Co₃ = 1mole of Na₂So₄
:. 0.0344 mole of Na₂Co₃ = 0.0344 mole of Na₂So₄
№ of mole= mass/ molar mass
Molar mass of Na₂So₄= (23×2)+32+(16×4)=142
:. 0.0344 = mass/142
1 mole of Na₂Co₃= 1 mole of CO₂
0.0344 mole of Na₂Co₃ = 0.0344 mole of CO₂
:. № of mole = volume/ molar volume = 0.0344 = volume of CO₂/22400cm³
C + heat
Formation of yellow flame
C + distilled water + shake
It readily dissolve in water
C is a soluble in water
Solution C + litmus paper
It changes moist red litmus to blue and no effect blue
Solution C is alkaline
1st portion of solution C + barium chloride
White precipitate formed
CO₃²⁻ , SO₄²⁻ , S²⁻ or SO₃²⁻
Add dilute HCl to product in (bi)
White precipitate dissolved
CO₃ , SO₃²⁻ or S₃²⁻
To the second portion add phenolphthalein
Purple colour observed
C is alkaline
Sulphur (iv) oxide and hydrogen sulphide.
Liberation of hydrogen gas with pop sound and formation of green iron (ii) chloride solution
Spatula, beaker, weighing balance, standard volumetric flask
Solution turns red
Turns from brown to green
A colourless, odourless, acidic gas liberated which turns blue litmus paper red and turn lime water milky.
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