Summary

• Description:

  The PDF document comprises Navakholo Joint Evaluation Test 1 Chemistry Paper 3 March 2026 Pre-Mock Exam with Marking Scheme. The marking scheme is in a different document.

  It was a KCSE Chemistry Paper 3 (Practical) examination. This paper assesses candidates' titration skills, thermometric analysis, and qualitative chemical analysis through three hands-on experiments requiring precise measurements, graph plotting, and systematic observation recording.

  • Month Administered: March 2026
  • Duration: 2½ hours
  • Total Marks: 40
  • Number of Questions: 3 (all compulsory)
  • Structure: Question 1 (21 marks), Question 2 (12½ marks), Question 3 (6½ marks)

  It covers the following topics:

  • Question 1 — Acid-Base Titration and Thermometric Titration
    • Procedure I: Diluting 2.0M NaOH (solution B) to prepare solution D; titrating solution D with an alkanoic acid solution C (25g/L) using phenolphthalein indicator; recording burette readings; calculating average volume of C, concentration of D, concentration of alkanoic acid, and molar mass of the alkanoic acid (1 mole acid: 3 moles base)
    • Procedure II: Thermometric titration — varying volumes of acid A and solution B; recording temperature changes; plotting a graph of ΔT vs. volume of solution A; determining volume at maximum temperature change; calculating mole ratio and concentration of acid A
  • Question 2 — Qualitative Analysis of Solid Q
    • Appearance description; solubility in water; tests with NaOH (dropwise then excess), aqueous ammonia (dropwise then excess), hydrogen peroxide + NaOH, barium nitrate, and acidified lead(II) nitrate
    • Recording observations and inferences in a table
  • Question 3 — Qualitative Analysis of Solid G
    • Ignition test on metallic spatula
    • Solubility in distilled water; tests with acidified potassium manganate(VII) and bromine water
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  CHEMISTRY

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