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NECO CHEMISTRY PRACTICAL ANSWER 2026
QUESTION 1
Volume of pipette used = 25.00 cm3
| Titration | Rough | 1 | 2 | 3 |
|---|---|---|---|---|
| Final burette reading (cm3) | 25.20 | 25.10 | 25.20 | 25.10 |
| Initial burette reading (cm3) | 0.00 | 0.00 | 0.00 | 0.00 |
| Volume of A used (cm3) | 25.20 | 25.10 | 25.20 | 25.10 |
(a)
(i) Average volume of A used, VA
VA = (25.20 + 25.10 + 25.20 + 25.10) / 4
VA = 100.6 / 4 = 25.15 cm3
(ii) Equation:
H2X(aq) + 2NaOH(aq) → Na2X(aq) + 2H2O(l)
(b)
(i) Concentration of B in mol/dm3
Concentration = Gram concentration / Molar mass
CB = (1/250 × 1000) / (23 + 16 + 1)
CB = 4 / 40 = 0.10 mol/dm3
(ii) Using:
(CAVA) / (CBVB) = nA / nB
(CA × 25.15) / (0.10 × 25.00) = 1 / 2
CA = (0.10 × 25.00) / (25.15 × 2)
CA = 0.0497 mol/dm3
(iii) Molar mass of A
Given: Mass concentration of A = 4.85 g/dm3
Molar mass = Mass concentration / Molarity
= 4.85 / 0.0497
= 97.59 ≈ 98 g/mol
(c)
- NaOH is deliquescent; it absorbs water, causing concentration to drop during measurement.
- It reacts with CO2 in air to form sodium carbonate.
- This contaminates the weighed mass and gives inaccurate molarity.
QUESTION 2
| S/N | TEST | OBSERVATION | INFERENCE |
|---|---|---|---|
| (a)(i) | C + 5 cm3 distilled water and shake thoroughly. Divide solution into three portions. | C dissolves to form a blue clear solution. | C is soluble in water. |
| (ii) | To first portion, add NaOH solution in drops, then in excess. | Blue gelatinous precipitate forms. Precipitate remains undissolved in excess. | Cu2+ present and confirmed. |
| (iii) | To second portion, add dilute NH3 solution in drops, then in excess. | Blue precipitate forms. Precipitate dissolves to give deep blue solution. | Cu2+ present and confirmed. |
| (iv) | To third portion, add BaCl2 solution. | White precipitate forms. | SO42− or SO32− |
| (v) | Add dilute HCl in excess to mixture in (iv). | Precipitate remains undissolved. | SO42− confirmed. |
QUESTION 3
(a)
(i) Methyl Orange
(ii)
- I. Yellow
- II. Red
(iii)
Methyl orange is suitable for a titration involving a strong acid (H2SO4).
(iv)
- Readings must be taken at the bottom of the meniscus.
- Rinse burette with solution to be used.
(v) Neutralization reaction.
(b)
(i)
- I. Hofmann Voltameter
- II. Kipp’s Apparatus
(ii)
AgNO3 decomposes in the presence of light.
2AgNO3 → 2Ag + 2NO2 + O2
Amber bottles prevent photodecomposition, keeping the solution clear and maintaining accurate concentration.
Kolade Kayode, known as Mr. KK, I am a Nigerian education blogger and founder of MasterWAEC.com. Passionate about student success, I simplifies WAEC exam preparation with accurate tips and resources to help students excel.
