VALENCIÀ CASTELLANO
LABORATORY SESSIONS

Physical Chemistry Laboratory I

Course Guide Laboratory Diary Report
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SESSION 1 CONDUCTOMETRIC DETERMINATION OF THE IONIZATION CONSTANT OF A WEAK ELECTROLYTE (ACETIC ACID)
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  1. Relate the ionization constant of the acetic acid with the dissociation degree and the activity coefficients.
  2. Determine the specific conductivity and the molar conductivity of the acetic acid solutions.
  3. Determine the ionization degree as function of the concentration and the molar conductivity.
  4. Determine the ionic strength and the average ionic activity coefficient.
  5. Determine the ionization/dissociation constant for the acetic acid.
SESSION 3 KINETIC STUDY OF THE DECOLORIZATION OF PHENOLPHTHALEIN IN ALKALINE SOLUTION
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  1. Determine the rate equation of the phenolphthalein decolorization reaction in alkaline solution by absorption spectroscopy under irreversibility and reversibility conditions.
  2. Determine kinetic parameters: partial orders, apparent constants, and absolute velocity constants.
  3. Apply the Ostwald isolation method.
  4. Analyze the effect of concentration on the reaction rate.
  5. Use a spectrophotometer to measure absorbances and relate them to concentration.
Instructions:
SESSION 4 STUDY OF THE EFFECT OF TEMPERATURE ON REACTION RATE
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  1. Analyze the effect of temperature on reaction rate.
  2. Relate rate constants and partial reaction times.
  3. Determine the activation energy of the reaction.
  4. Determine the experimental law of rate of the oxidation reaction of hydroiodic acid by hydrogen peroxide in acidic medium (pseudo-order of reaction and apparent rate constant).
SESSION 5 KINETIC STUDY OF THE REACTION BETWEEN IODINE AND ACETONE CATALYSED BY ACID
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  1. Sequential determination of kinetic parameters: partial orders, apparent rate constants and absolute rate constants.
  2. Application of Ostwald isolation method.
  3. Verification of coherence between rate law and the reaction mechanism.
SESSION 6 PHASE DIAGRAM: BOILING TEMPERATURE - COMPOSITION OF A BINARY LIQUID MIXTURE
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  1. Constructing the phase diagram, boiling temperature-composition of the methanol-chloroform mixture.
  2. Determining the composition of the vapor phase (mole fraction) using the refractive index.
  3. Determining the boiling temperature of binary mixtures.
  4. Characterizing the azeotropic point (azeotropic composition) of the binary mixture.
  5. Determining activity coefficients of the pure components and of the binary mixtures in liquid and vapor phases.
Instructions: