CONDUCTOMETRIC DETERMINATION OF THE IONIZATION CONSTANT OF A WEAK ELECTROLYTE (acetic acid)
OBJECTIVES:
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.
SPECTROPHOTOMETRIC DETERMINATION OF THE PK OF AN INDICATOR
OBJECTIVES:
1. Obtain the absorption spectrum of methyl orange at different pHs.
2. Locate the isosbestic point.
3. Use the spectrophotometer to measure absorbances and relate them to the concentration.
4. Prepare buffer solutions from formic acid and NaOH and obtain their pH.
5. Determine the pKa of methyl orange from absorbance measurements.
KINETIC STUDY OF THE DECOLORIZATION OF PHENOLPHTHALEIN IN ALKALINE SOLUTION
OBJECTIVES:
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.
STUDY OF THE EFFECT OF TEMPERATURE ON REACTION RATE
OBJECTIVES:
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).
KINETIC STUDY OF THE REACTION BETWEEN IODINE AND ACETONE CATALYSED BY ACID
OBJECTIVES:
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.
PHASE DIAGRAM: BOILING TEMPERATURE - COMPOSITION OF A BINARY LIQUID MIXTURE
OBJECTIVES:
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.
