Dehydration Of Bluestone Lab Report
The Dehydration of a Bluestone
February.28.2008
Purpose
• To determine the value of X in CuSO4 • xH2O.
Materials • Crucible
• Blue Stone
• Bunsen Burner
• Bunsen Lighter
• Test Tube
• Water
• Rheostat
• Clay Triangle
• Electronic Balance
Procedure
A clean crucible was taken and weighed on an electronic balance. The mass was then written down. 2g of bluestone was placed in the crucible and weighed. The mass of the blue solid was written down. The crucible was placed on a clay triangle and was heated by the Bunsen burner. When the blue color disappeared, the crucible was left to cool. After the crucible had cooled, the crucible was placed on the electronic balance to be weighed for its final mass of crucible and anhydrous …show more content…
Mass of Crucible 14.82 g
Mass of crucible and CuSO4 •xH2O 15.95 g
Mass of Crucible and anhydrous CuSO4 15.52 g
Calculations ------ Molar Mass of Copper Sulphate -> 64.0+32.1+16*4 = 160.1 g/mol
Mass of Crucible 14.82 g No Calculation
Mass of Crucible and Solid 15.95 g No Calculations
Mass of Crucible and Anhydrous Solid 15.52 g No Calculations
Mass of CuSO4 • xH2O 15.95 g – 14.82 g = 1.130 g 1.13 …show more content…
How do you know when the copper (2) sulphate has been converted to it anhydrous form?
• When the blue color changes to a white/grayish color after being heated.
2. Rewrite the equation for this replacing “X” with your experimental value.
• CuSO4 • 5H2O
3. If the accepted value of X=5, calculate the percentage of error of your experiment.
%error = | accepted value – experimental value | / (accepted value) * 100 |
• % error –> | 5.4 – 5.0| / (5.0) * 100 = 8%
4. Was the change in #4 an endothermic or exothermic reaction?
• The change in #4 was an exothermic (releases heat) reaction.
Two Major Sources of Error
• One source or error in this experiment can be caused by some water vapor from the air being absorbed back into the crystal as soon as the burner is turned off. The mass would be higher because of the added H2O. Therefore, when the crucible is weighed it would give a different
February.28.2008
Purpose
• To determine the value of X in CuSO4 • xH2O.
Materials • Crucible
• Blue Stone
• Bunsen Burner
• Bunsen Lighter
• Test Tube
• Water
• Rheostat
• Clay Triangle
• Electronic Balance
Procedure
A clean crucible was taken and weighed on an electronic balance. The mass was then written down. 2g of bluestone was placed in the crucible and weighed. The mass of the blue solid was written down. The crucible was placed on a clay triangle and was heated by the Bunsen burner. When the blue color disappeared, the crucible was left to cool. After the crucible had cooled, the crucible was placed on the electronic balance to be weighed for its final mass of crucible and anhydrous …show more content…
Mass of Crucible 14.82 g
Mass of crucible and CuSO4 •xH2O 15.95 g
Mass of Crucible and anhydrous CuSO4 15.52 g
Calculations ------ Molar Mass of Copper Sulphate -> 64.0+32.1+16*4 = 160.1 g/mol
Mass of Crucible 14.82 g No Calculation
Mass of Crucible and Solid 15.95 g No Calculations
Mass of Crucible and Anhydrous Solid 15.52 g No Calculations
Mass of CuSO4 • xH2O 15.95 g – 14.82 g = 1.130 g 1.13 …show more content…
How do you know when the copper (2) sulphate has been converted to it anhydrous form?
• When the blue color changes to a white/grayish color after being heated.
2. Rewrite the equation for this replacing “X” with your experimental value.
• CuSO4 • 5H2O
3. If the accepted value of X=5, calculate the percentage of error of your experiment.
%error = | accepted value – experimental value | / (accepted value) * 100 |
• % error –> | 5.4 – 5.0| / (5.0) * 100 = 8%
4. Was the change in #4 an endothermic or exothermic reaction?
• The change in #4 was an exothermic (releases heat) reaction.
Two Major Sources of Error
• One source or error in this experiment can be caused by some water vapor from the air being absorbed back into the crystal as soon as the burner is turned off. The mass would be higher because of the added H2O. Therefore, when the crucible is weighed it would give a different