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CP9: Ka of a Weak Acid

Finding the Ka value for a weak acid using pH measurement

Required PracticalEdexcelA-Level

๐Ÿ”ฌ Equipment Required

  • pH meter or probe
  • Burette
  • Pipette and filler
  • Conical flask
  • Weak acid (e.g., ethanoic acid)
  • Strong base (e.g., NaOH)
  • Standard buffer solutions (for calibration)
  • Magnetic stirrer (optional)
  • Wash bottle

๐Ÿฆบ Safety Precautions

  • Wear safety glasses
  • Sodium hydroxide is corrosive
  • Calibrate pH meter before use
  • Handle glass electrode carefully

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About CP9: Ka of a Weak Acid

CP9: Ka of a Weak Acid is a required practical for Edexcel A-Level Chemistry. This practical finding the ka value for a weak acid using ph measurement

Students are expected to understand the method, identify and control variables, use appropriate equipment, analyse results, draw graphs, identify sources of error, suggest improvements, and consider safety precautions.

Questions on required practicals frequently appear in Edexcel A-Level Chemistry exams and can be worth significant marks. Practice with our AI-generated questions to master this practical.

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