FRONT COVER LAB REPORT
CHM 456
PREPARED BY : AHMAD FAIZ ZIKRI BIN ALIAS
GROUP
AS 202 2M1
DATE
16/3/2015
TIME
3.10 PM – 6.00 PM
LECTURER’S NAME
Dr. rer. nat MOHD TAJUDIN MOHD ALI
OBJECTIVE:
To separate a mixture of benzoic acid and a neutral compound (triphenylmethanol or 1,2,4,5-tetrachlorobenzene) into its components by extraction and also to get the melting point.
THEORY: Extraction is a process of transferring a solute from one solvent to another. In this experiment, a mixture of benzoic acid and a neutral compound (triphenylmethanol or 1,2,4,5-tetrachlorobenzene) into its components by extraction. The mixture is dissolved in diethyl ether (common name is ether). Both components are soluble in this solvent. Then a 1 M NaOH solution is used to extract the benzoic acid in the form of its water-soluble salt, sodium benzoate (three extractions to ensure complete removal), leaving the neutral compound in the ether layer. The three aqueous extracts are combined and the two components are recovered as follow:
1. The neutral compound by washing, drying and evaporating the ether layer.
2. Benzoic acid by acidifying the aqueous layer to form benzoic acid, which precipitates. The benzoic acid is then recovered by filtration, washed and dried.
PROCEDURE:
1. 0.24 grams of unknown sample and 0.12 grams of benzoic acid are weighed and was placed in a test tube.
2. 10 mL ether (very flammable, toxic) was added to the mixture and the test tube was shaked to dissolve the mixture.
3. Then the solution was transferred to the separatory funnel and 5 mL of 1M NaOH was added. It was cap tightly. The layers was mixed by swirling and shaking gently for 30 seconds.
4. Any pressure was vented by tilting the funnel and opening the stop cork.
5. The stop cork was closed, shaked and again vented. The mixture was held stand to allow the layers to separate.
6. The top layer was the ether layer and the bottom layer was the aqueous layer.
7. The aqueous layer was drained into an erlenmeyer flask
PREPARED BY : AHMAD FAIZ ZIKRI BIN ALIAS
GROUP
AS 202 2M1
DATE
16/3/2015
TIME
3.10 PM – 6.00 PM
LECTURER’S NAME
Dr. rer. nat MOHD TAJUDIN MOHD ALI
OBJECTIVE:
To separate a mixture of benzoic acid and a neutral compound (triphenylmethanol or 1,2,4,5-tetrachlorobenzene) into its components by extraction and also to get the melting point.
THEORY: Extraction is a process of transferring a solute from one solvent to another. In this experiment, a mixture of benzoic acid and a neutral compound (triphenylmethanol or 1,2,4,5-tetrachlorobenzene) into its components by extraction. The mixture is dissolved in diethyl ether (common name is ether). Both components are soluble in this solvent. Then a 1 M NaOH solution is used to extract the benzoic acid in the form of its water-soluble salt, sodium benzoate (three extractions to ensure complete removal), leaving the neutral compound in the ether layer. The three aqueous extracts are combined and the two components are recovered as follow:
1. The neutral compound by washing, drying and evaporating the ether layer.
2. Benzoic acid by acidifying the aqueous layer to form benzoic acid, which precipitates. The benzoic acid is then recovered by filtration, washed and dried.
PROCEDURE:
1. 0.24 grams of unknown sample and 0.12 grams of benzoic acid are weighed and was placed in a test tube.
2. 10 mL ether (very flammable, toxic) was added to the mixture and the test tube was shaked to dissolve the mixture.
3. Then the solution was transferred to the separatory funnel and 5 mL of 1M NaOH was added. It was cap tightly. The layers was mixed by swirling and shaking gently for 30 seconds.
4. Any pressure was vented by tilting the funnel and opening the stop cork.
5. The stop cork was closed, shaked and again vented. The mixture was held stand to allow the layers to separate.
6. The top layer was the ether layer and the bottom layer was the aqueous layer.
7. The aqueous layer was drained into an erlenmeyer flask