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  Drug-Excipient Interactions

  Maria Ballester

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  Apparent Dissociation Constant of a Porphyrin

  Maria Ballester and Victor Castro

  The purpose of this laboratory is to determine the apparent acid dissociation constant, 𝐾_a, by estimating the p𝐾_a value of a porphyrin using visible spectrophotometry. This apparent p𝐾_a value is measured by graphic interpolating the absorbance changes obtained at varied wavelengths for different acid concentrations using the Henderson–Hasselbach equation.

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  Calculating Avogadro's Number

  Maria Ballester and Victor Castro Ph.D.

  The value of Avogadro's number is found by using kinetic theory along with (a) the volume change upon sublimation of a small quantity of dry ice (CO₂), and (b) the diffusion length, as a function of time, of iodine in air at a certain temperature.

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  Formation of Iron(III) Thiocyanate - Stopped Flow

  Maria Ballester and Victor Castro

  The purpose of this laboratory is to determine the equilibrium constant and the forward and reverse rate constants for the formation of Iron(III) Thiocyanate.

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  Introduction to 2-d Plots with Excel

  Maria Ballester and Victor Castro Ph.D.

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  Bomb Calorimeter

  Maria Ballester and Arthur Sikora

  The purpose of this laboratory is to determine the heat of combustion of a sample of sugar and artificial sweeteners by using an IKA Bomb Calorimeter (C200si).