Isopropanol Lab Report

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Solvent systems are incredibly useful for a variety of applications, namely purification. The particular polar characteristics of any pure solvent can be tuned by the addition of a miscible second solvent with different polarity. This phenomenon is exploited in purification techniques such as thin layer chromatography or column chromatography.1 The mixing of miscible solvents of different likewise affects the miscibility of a third solvent component.2 In this experiment, the solubility of water, benzene, and 2-isopropanol was explored. It is important to note the individual miscibility of the 3 distinct binary systems that are possible. Benzene is only minutely miscible in water, with a value of 1.79g/L at 15°C.4 Water and 2-isopropanol however…show more content…
The amounts of water that can for a homogenous system vary depending on the mole fractions of the components.2 The various points once plotted form a distinct boundary called the miscibility dome which separates the portions of the plot that indicate a homogenous system from the portions that represent a heterogeneous one.2 For a particular point that lies underneath the miscibility dome, there is no single composition but rather an equilibrium between two phases of different composition that are in equilibrium.5 Indices of refraction are of interest in this experiment as well. Every transparent medium affects bends light a slightly different amount and can be used to evaluate the composition of the different phases in a heterogeneous mixture in order to determine which homogeneous solutions along the miscibility dome are in equilibrium providing the tie lines of the diagram.6 The tie lines once extrapolated, converge to a point on the miscibility dome called the critical point, called the Plait Point, which indicates the point that relative volumes of the two phases become equal and the boundary vanishes as the system becomes a homogeneous…show more content…
Burettes were used in order to ensure that the correct proportions were dispensed into a beaker, forming the miscible benzene:isopropanol solutions into which water would be slowly titrated until phase separation occurred. About 30mL solutions of different mole fractions benzene and isopropanol were prepared. The first solution titrated was 10% (wt) isopropanol to 90% benzene. The amount of water titrated in was recorded and the refractive index of the system was measured and also documented. This process was repeated with solutions forming the miscibility dome by changing the mole fractions, increasing the %wt composition of isopropanol in 10% increments and conversely decreasing the %wt of benzene

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