Summary

• Description:

  The MS Word document comprises KALA Trial Chemistry Paper 3 2026 Mock Exam with Marking Scheme. The PDF version is also available upon your request. The marking scheme is in a different document.

  It was a KCSE Chemistry Paper 3 (233/3) practical mock examination designed for Form 4 candidates.

  This hands-on practical exam assesses laboratory proficiencies in double acid-base titrations, enthalpy of reaction thermochemical measurements, and qualitative inorganic and organic analysis.

  • Month Administered: March 2026
  • Duration: 2 Hours 15 Minutes
  • Total Marks: 40 Marks
  • Number of Questions: 3 Questions (Questions 1 - 3)
  • Structure: Laboratory practical examination comprising volumetric/thermochemical analysis and qualitative analysis

  It covers the following topics:

  • Question 1 (Quantitative Analysis & Thermochemistry):
    • Standardization of sodium hydroxide using hydrated ethanedioic acid (oxalic acid)
    • Serial dilution and titration of hydrochloric acid to determine molarity
    • Thermochemical enthalpy determination of the displacement reaction between metal M and hydrochloric acid
    • Molar heat of reaction calculations and determining the mass per unit length of metal M
  • Question 2 (Qualitative Inorganic Analysis):
    • Thermal decomposition and litmus test for evolved gases from solid F
    • Precipitation reactions with aqueous sodium hydroxide and barium nitrate
    • Redox reactions using hydrogen peroxide in basic media to identify cations and anions
  • Question 3 (Qualitative Organic Analysis):
    • Combustion and flammability testing of organic liquid G on a watch glass
    • Miscibility and solubility testing with distilled water
    • Testing for carboxylic acids/effervescence using solid sodium hydrogen carbonate (NaHCO3)
    • Redox testing with acidified potassium dichromate(VI) and potassium manganate(VII) to confirm functional groups
• File Size:

  50.34 KB
• Length:

  6 pages
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  Chemistry
• Posted By:

  Caleb_Peter

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