Summary

• Description:

  The MS Word document comprises Mumias West Sub-County Joint Evaluation Chemistry Paper 3 May 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' ability to conduct volumetric analysis and thermometric titrations, process experimental data, draw graphs, and determine concentrations through hands-on laboratory procedures.

  • Month Administered: May 2026
  • Duration: 2¼ hours (including 15 minutes reading time)
  • Total Marks: 40
  • Number of Questions: 3
  • Structure: Question 1 (22 marks), Question 2 (12 marks), Question 3 (6 marks) — all compulsory; calculators permitted

  It covers the following topics:

  • Procedure I — Acid-Base Titration
    • Preparation of diluted sulphuric acid solution (solution S) from solution P
    • Titration of sulphuric acid (solution S) against sodium carbonate (solution Q) using methyl orange indicator
    • Recording and averaging burette readings
    • Calculating molarity of sodium carbonate, concentration of solution S, and concentration of original sulphuric acid (solution P)
  • Procedure II — Thermometric Titration
    • Reacting varying volumes of sulphuric acid with sodium hydroxide solution (solution R)
    • Recording temperature changes and completing a results table
    • Plotting a graph of temperature change vs. volume of acid
    • Determining maximum temperature change and equivalence point from the graph
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  CHEMISTRY

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