Introduction:

The intent of this experiment is to look into the composing of compounds in Panacetin. Generally. it is made up of saccharose. acetylsalicylic acid and an unknown constituent. either acetanilide or acetophenetidin. SinceBy utilizing different techniques. such as filtration. extraction. and vaporization. those three constituents have been isolated out. which is based on varies solubility and acid-based belongingss. The per centum of composing of Panacetin are besides found. which is based on the mass of three dried constituents.

The procedure:

“panacetin” + Dichloromethane Solid sucrose + acetylsalicylic acid + unknown constituent ( By Filtration ) Aspirin + unknown constituents + NaOH aqueous bed + organic bed Aqueous bed + HCl acetylsalicylic acid ( By filtration )

Organic bed Unknown ( By Evaporation )

Procedure and Observation:

0. 30093 g of panacetin was weighed and assorted good with 50 milliliters of methylene chloride. After stirring the solution exhaustively. some solid is formed ( solid saccharose ) and liquid. With utilizing a preweighed filter paper to filtrate the mixture. and after the saccharose had dried. it was weighed out to 0. 7756g. For the aqueous bed. adding 10ml of 6M HCl ( pH 2 ) and filtered utilizing vacuity filtration and after cooled in the ice bath. Leaving buttocks is the solid acetylsalicylic acid which was weighed out as 1. 2469g. Last. to mensurate the weight of the unknown solid constituent of panacetin. seting the organic bed in a warm H2O bath to vaporize the dissolver and the remain is the solid residue.

Extract the unknown solid constituent of panacetin. which was weighed to be 0. 8946g. After step the unknown constituent. reassigning the sample into the beaker with the hot H2O to fade out the sample wholly and so allowing it cool by seting the beaker into the ice. After that. roll up the solid by vacuum filtration and the filtered merchandise was weighed 1. 1759g In order to mensurate the thaw point. set the sample into the trial tubing and put the tubing into the machine to heat it up. This helps to run the sample by seting the heat energy into the system. From the consequence. the sample starts thaw at 72°C and wholly melt at 84°C.

Consequence:

The theatrical mass per centum: sucrose 10 % . aspirin 40 % . unknown 50 % . The theoretical thaw point of phenylacetamide is 90 ?C and the theoretical thaw point of acetophenetidin is 110 ?C The existent mass per centum:

Sucrose mass per centum: ( 2. 1409-1. 3663 ) / 3. 0093*100 % = 25. 74 % Aspirin mass per centum: ( 1. 2469/3. 0093 ) *100 % = 41. 43 %
Unknown mass per centum: ( 1. 1759/3. 0093 ) *100 % = 39. 07 %
Actual thaw point: The runing point of the sample is 84 ?C. so it is acetanilide.

Discussion

The amount up of the existent mass of saccharose. acetylsalicylic acid and unknown mass sample is 3. 1974g. The ground why the entire mass is greater than the mass of the original mass. 3. 0093g because the excess mass was deriving from the procedure of adding hot H2O to fade out the merchandise. It could besides intend that my lab spouse and I did non give sufficient clip for the sample to recrystallize. There is difference runing point of phenylacetamide compared to its theoretical thaw point. The ground is that the sample has a little thaw point scope. In my sentiment. even though we have used quicksilver research lab thermometer. since the sample has a little thaw point scope. in order to cut down the mistake made from reading the temperature. we should utilize more sensitive and accurate thermometer to happen out the more “accurate” thaw point of the sample. I would reason that the thaw point that our group found is 84 ?C. which is near adequate to the theoretical thaw point.

Decision:

It can be concluded that in 3. 0093g of Panacetin. its composing is distributed as 25. 74 % of surcrose. 41. 4 % of Aspirin and 39. 07 % of phenylacetamide. The runing point of phenylacetamide is 84 ?C. which is near adequate to the theatrical thaw point. 90 ?C because phenylacetamide has a little thaw point scope.