Dumas Method Lab Report (1).pdf - 1 Error Reference source not found Experiment 1 Dumas Method Purpose In this lab we will conclude the identity of a

# Dumas Method Lab Report (1).pdf - 1 Error Reference source...

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Error! Reference source not found. 1 Experiment 1: Dumas Method Purpose In this lab we will conclude the identity of a clear colourless organic liquid, by determining its molar mass and comparing it to the universal molar masses of other organic compounds. To obtain the molar mass we will use the Dumas method. Introduction A key property that enables researchers to identify a substance is its molar mass. When the substance in question is volatile in nature, it is common practice to find the molar mass using the Dumas method. The Dumas method was created In the early 19th century by French chemist Jean-Baptiste Dumas, and relies heavily upon the fact that volatile liquids can be easily converted to gas (1) . Due to this fact we can use the ideal gas law equation PV=nRT (where P is the atmospheric pressure, V is the measured volume of the vessel, T is the absolute temperature of the water bath, n is the number of moles and R is the ideal gas constant) (2) to first determine the moles of the unknown substance and subsequently the molar mass using the equation M=m/n (where M is molar mass, n is moles and m is the mass of the gas) (3) . Like many experiments, the Dumas method is based upon an assumption that is essential to the overall reliability of the experiment. The assumption for this experiment is that the compound vapour behaves ideally, meaning that all collisions between its molecules are perfectly elastic so they collide but do not interact with each other (4) . Procedure Materials: Two 600 mL beakers Three 125mL Erlenmeyer flasks 100 mL graduated cylinder Hot plate Temp probe Top-loading balance Tongs Magnetic stir bar 3 pieces of 2.5 x 2.5 aluminium foil

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• Winter '08
• carran

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