Simple Lab Technique

Simple Lab Technique

Partner:

Introduction:

This Lab tests the students to follow directions and learn how to properly a Bunsen burner, handle solids and liquids, use an electronic balance, and learn safety techniques.

Materials:

1. Goggles

2. Bunsen burner

3. Crucible tongs

4. Striker (or match)

5. Copper wire

6. Ceramic dish

7. Electronic balance

8. Small plastic container for "mass boat"

9. Spatula

10. Sodium Chloride (NaCl)

11. Test tube

12. 2 150 mL beaker

13. Water

14. Graduated cylinder

15. Glass stirring rod

Methods/Procedure Taken:

1. The goggles were put on as entering the room.

2. The hose of the burner was first checked to see if there were any holes and then attached to the gas outlet. The gas was turned on and the striker was struck about a centimeter from the top of the burner.

3. Once the orange flame appeared, the airports and valve was adjusted to create a blue flame with a light blue inner cone.

4. Tongs were used to place a piece of copper wire in the part of the flame labeled "a" for 15 to 25 seconds, then to "b" and "c". The observations of the copper wire were recorded.

5. The air ports of the burner were adjusted and closed.

6. The color and sounds of the flame were compared to the ones of the adjusted blue flame, and recorded.

7. Leaving the flame as it is, tongs were used to hold a ceramic dish upside down in the tip of the flame for 2 minutes.

8. After 2 minutes, the dish was set on the countertop without being touched. As it cooled, the underside of it was observed and recorded.

9. The electronic balance was used to measure Sodium Chloride. A mass boat was placed on the beaker, zeroed out, and 10 grams of Sodium Chloride was placed on the mass boat with a spatula. The measured Sodium Chloride was slid into the test tube.

10. A dry 150 mL beaker was measured and recorded in the data table.

11. Three different volumes of water measured in the beaker and the combined volume was weighed and recorded. The mass of the empty beaker was subtracted from all of the measurements to find the mass of the water alone, and was recorded.

12. A second dry 150 mL beaker was measured and recorded.

13. Three different volumes of water were measured in a graduated cylinder and the combined volume was weighed and recorded. The mass of the empty beaker was subtracted from all of the measurements to find the mass of the water alone, and was recorded.

14. One of the beakers, still with water inside, was added with 10 grams of Sodium Chloride from the test tube. The other beaker was emptied.

15. The glass stirring rod was placed and held straight up in the empty beaker and the beaker with Sodium Chloride and water had its spout against the rod and poured, dividing the solid Sodium Chloride and water.

Data Table/Illustration:

Mass of 150 mL beaker and volumes of water

Dry w/40ml of water w/ 80ml of water w/ 120ml of water

Mass of:

150ml beaker measured with beaker (g) 69.8g 102.26g 143.03g 182.65g

Water measured with beaker (g) 0g 32.46g 73.23g 112.85g

150ml beaker measured with graduated cylinder. (g) 84.54g 121.3g 165.05g 199g

Water measured with graduated cylinder (g) 0g 36.76g 80.51g 114.46g

The mass of the beaker and the different volumes of water, measured with the beaker and the graduated cylinder, were recorded in the data table and compared. The combined masses were subtracted by the mass of the empty beaker to find the mass of the water alone.

Calculations: Mass of 40mL of water measured with beaker: 102.26g-69.8g= 32.46g

Mass of 80mL of water measured with beaker: 143.03g-69.8g= 73.23g

Mass of 120mL of water measured with beaker: 182.65g-69.8g= 112.85g

Mass of 40mL of water measured with graduated cylinder: 121.3g-84.54g= 36.76g

Mass of 80mL of water measured with graduated cylinder: 165.05g-84.54g= 80.51g

Mass of 120mL of water measured with graduated cylinder: 199g-84.54g= 114.46g

Results:

The copper wire placed in the part of the blue flame labeled "a" turned orange in the flame but cooled down in three