Existence of Hydrogen Bonds Between Ethanol Molecules
Experiment 9
Aim
A. To investigate the existence of hydrogen bonds between ethanol molecules. B. To measure the strength of hydrogen bond formed between ethanol molecules C. To investigate the formation of hydrogen bonds between molecules of ethyl ethanoate and trichloromethane. D. To measure the strength of hydrogen bond formed between molecules of ethyl ethanoate and trichloromethane.
Procedure
A.
1. 10 cm3 of ethanol was added into an insulated 50 cm3 beaker by using a measuring cylinder. The temperature of the liquid was measured. 2. 10 cm3 of cyclohexane was added to the ethanol in the beaker. It was then mixed well and the lowest temperature attained was recorded.
B.
1. 10 cm3 of ethanol was added into an insulated 50 cm3 beaker by using a measuring cylinder. The temperature of the liquid was measured. 2. 20 cm3 of cyclohexane was added to the ethanol in the beaker. It was then mixed well and the lowest temperature attained was recorded.
C.
1. 10 cm3 of ethyl ethanoate was measured into an insulated beaker. Its temperature was recorded. 2. This was added to 10 cm3 of trichloromethane and was mixed well. The highest temperature attained was recorded.
D.
1. 10 cm3 of ethyl ethanoate was measured into an insulated beaker. Its temperature was recorded. 2. This was added to 10 cm3 of trichloromethane and was mixed well. The highest temperature attained was recorded.
Result
Temperature change of solution
| |A |B |C |D |
|Initial(oC) |19.5 |20.5 |20 |18 |
|Final(oC) |16 |16.5 |27 |26 |
|Net(oC) |-3.5 |-4 |7
Aim
A. To investigate the existence of hydrogen bonds between ethanol molecules. B. To measure the strength of hydrogen bond formed between ethanol molecules C. To investigate the formation of hydrogen bonds between molecules of ethyl ethanoate and trichloromethane. D. To measure the strength of hydrogen bond formed between molecules of ethyl ethanoate and trichloromethane.
Procedure
A.
1. 10 cm3 of ethanol was added into an insulated 50 cm3 beaker by using a measuring cylinder. The temperature of the liquid was measured. 2. 10 cm3 of cyclohexane was added to the ethanol in the beaker. It was then mixed well and the lowest temperature attained was recorded.
B.
1. 10 cm3 of ethanol was added into an insulated 50 cm3 beaker by using a measuring cylinder. The temperature of the liquid was measured. 2. 20 cm3 of cyclohexane was added to the ethanol in the beaker. It was then mixed well and the lowest temperature attained was recorded.
C.
1. 10 cm3 of ethyl ethanoate was measured into an insulated beaker. Its temperature was recorded. 2. This was added to 10 cm3 of trichloromethane and was mixed well. The highest temperature attained was recorded.
D.
1. 10 cm3 of ethyl ethanoate was measured into an insulated beaker. Its temperature was recorded. 2. This was added to 10 cm3 of trichloromethane and was mixed well. The highest temperature attained was recorded.
Result
Temperature change of solution
| |A |B |C |D |
|Initial(oC) |19.5 |20.5 |20 |18 |
|Final(oC) |16 |16.5 |27 |26 |
|Net(oC) |-3.5 |-4 |7