Transcription of Core practical 9: Determine Ka for a weak acid
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Core practical 9: Determine Ka for a weak acid
EDEXCEL Chemistry Teacher Resource Pack 2 Pearson Education Ltd 2016 This document may have been altered from the original 1 Core practical 9 Teacher sheet Determine Ka for a weak acid practical activities have been safety checked but not trialled by CLEAPSS. Users may need to adapt the risk assessment information to local circumstances. Core practical 9: Determine Ka for a weak acid Objective To Determine Ka for a weak acidSafety Specification links Wear a lab coat and use eye protection. Tie long hair back. Sodium hydroxide solution is an irritant. practical techniques 1, 3, 4, 6, 11 CPAC 1a, 2a, 2b, 3a, 4a, 4bProcedure Notes on procedure up the datalogger to read the pH, orcalibrate the pH cm3 of mol dm 3 ethanoic acidsolution into a 250 cm3 conical a burette with sodium hydroxide two or three drops of phenolphthalein tothe conical the ethanoic acid with sodiumhydroxide solution until the mixture just a further cm3 of mol dm 3ethanoic acid solution into the 250 cm3conical the pH of this solution.
1. Set up the datalogger to read the pH, or calibrate the pH meter. 2. Pipette 25.0 cm3 of 0.1 mol dm−3 ethanoic acid solution into a 250 cm3 conical flask. 3. Fill a burette with sodium hydroxide solution. 4. Add two or three drops of phenolphthalein to the conical flask. 5. Titrate the ethanoic acid with sodium
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