Chem Lab

The objectives of this experiment included an introduction to basic laboratory
techniques by getting acquainted with the Bunsen burner, balance, and pipette.These skills we learned helped us to determine the density of several unknowns.
Initially we lit the Bunsen burner by attaching the tubing from the burner, and by turning the gas valve on.Next the striker was used to ignite the gas, making sure the flame was the hottest, by ensuring that it was a pale blue color with three distinct cones.We then slightly adjusted the air control valve until hearing a slight buzzing, indicating that the burner was at the hottest non-luminous flame our Bunsen burner could achieve.Upon reaching that point, tongs were used to place wire gauze approximately one centimeter above and parallel to the burner top.This helped us observe the heat zones of the flame.The hottest part of the flame is the second cone which is understandable since that was the part of the flame where when we placed the wire gauze the color that appeared on the wire gauze was orange.Next we estimated the temperatures of the various parts of the flame by placing two, one centimeter strips of copper, iron and aluminum wire in each cone.We then measured the mass of a beaker, test tube, graduated cylinder and various other experimental tools.Next we found the density of the water-insoluble solid by dividing the mass by the volume.We measured the mass by using the balance, and found the volume by sliding the solid in the graduated cylinder at a forty-five degree angle so it wouldn't splash everywhere and then we subtracted the volume of the water.We then found the mass of the water and unknown liquid by weighing it on the balance and subtracting the mass of the beaker and the volume by the scale on the graduated cylinder.

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