Impact of a water Jet laboratory - Lab Report Example

The term molar mass of a given substance is often used to refer to the mass of one mol of a substance (Computer-Based Laboratory, 2007). In mathematical terms, it is often expressed as an average molecular mass of molecules in the given substance when multiplied by Avogadro’s constant often approximated as 6.022×1023. It can be shown molar mass = (1/6.022) ×10-23g/u) × (6.022×1023/mol) × average molecular mass (Lide, 2005).This experiment was set up to use the freezing point depression to determine the molecular mass of benzoic acid.

This was possible by first determining the freezing point of pure lauric acid and lauric- benzoic mixture, then calculating the molality of solution and the moles of benzoic acid as shown below. In this lab Experiment the apparatus and materials used included Lab Quest , Lab Quest App Temperature Probe, two 18 × 150 mm test tubes 400 mL beaker, ring stand, paper towel or tissue 4 – 1, Lab Quest 4, lauric acid, CH3(CH2)10COOH lauric acid-benzoic acid mixture hot water bath and the utility clamp.

In this experiment the procedure was as follow. The initial step involved obtaining and wearing goggles. This was followed by connecting the Temperature Probe to Lab Quest and choosing New from the File menu. For the case where one had an older sensor that does not auto-ID, manually, he/she had to set up the sensor. The next step involved tapping the rate on the Meter screen, then changing the data-collection rate to 1 sample/second and the data-collection length to 600 seconds. This was part one of the experiment in which one had to determine the Freezing Temperature of Pure Lauric Acid.

After this part, the next procedure was to add about 300 mL of tap water with a temperature of 20–25°C to a 400 mL beaker and then placing the beaker on the base of the ring stand. The utility clamp was then used to obtain a test tube containing hot, melted lauric acid from the instructor while making sure