Today We Did A Lab!!!

HYDRATE LAB
Materials:
-Bunsen burner
-Test tube
-Test tube rack
-Test tube clamp
-Weight scale
-Cobaltous chloride hexahydrate
 
Procedure:
1. Weigh the empty test tube
2. Fill a test tube with about 1cm with hydrate
3. Carefully place the test tube on the scale and record the mass of the hydrate and test tube
4. Connect and light your bunsen burner. Adjust the gas flow till the flame is about 5 cm tall.
5. Pick up the test tube with the lab clamps and carefully move the tube back and forth over the flame
6. Heat the test tube for about 5 minutes over the flame or until all the water has evaporated
7. Carefully re-weigh the test tube

Observations:
Mass of tube - 21.35 g
Mass before heating - 21.79 g
Mass after heating - 21.65 g

Analysis:
1. Determine how much water was released during heating.
mass before heating- mass after heating = mass of water released during heating
21.79- 21.65 = 0.14g

2. What percent of the hydrate was water?
mass of water released/ mass after heating = percent of hydrate
0.14/ 21.65= 32%

Conclusion:
(The actual percent of water in this hydrate is 45%)
1. Determine  your percent error.
[(measured value- actual value)/ actual value] x100 = percent error
[(32-45)/ 45] x100= 29%



-Nicole