Determination of the identity of an unknown liquid
Chemistry Lab
Report
Purpose
The purpose of this lab is to determine the identity of an unknown liquid by measuring its density and its boiling point and try to match it with those solutions given in Table 2 of experiment 2.
Procedure
Part A
In Part A, The main purpose was to find the determination of the density of the unknown (j41) and by doing that we had to determine volumes of the unknown liquid (j41) using three different volumetric devices which are graduated cylinder, pipette and burette. Then we had to perform three measurement trials on each device.
Graduated cylinder: I dried a clean 50.0 ml graduated cylinder and also measured with a balance and I got 66.39g after measuring the empty cylinder I added 15.0ml of the unknown liquid (j41) and measured it and I got 77.65g and I continued adding 15 ml until I had the total liquid in the cylinder to be at 45.0ml and I got 89.30g and
100.72g for my trials at 30.0 ml and 45.0 ml.
Pipette and burette: I weighed a clean dry 150 ml beaker and I saw it was 64.21g and I used a pipette to measure out 10ml of the unknown liquid (j41) and poured it into the beaker and reweighed the beaker which was now 83.22g and i added more 10ml to my 2nd trial and 20ml for my 3rd trial and I got 102.41g and 121.35g respectively. (I accidently used a 25ml pipette which I noticed at the end of the lab so instead of adding 10 ml each into each trial I was adding 25ml).
I filled a burette with the unknown liquid (j41), having an initial burette reading of 0.00ml and by using the burette I was pouring in
13ml of the liquid into the beaker and measuring the mass of the beaker for the 1st trial with 13ml I found its mass to be 74.02g and the
2nd trial with 26ml I found its mass to be 83.95g and on the 3rd trial I found its mass to be 93.68g.
Part B
In the part I clean and dried a 75 ml test tube and added 15 drops of the unknown solution (j41) into the test tube. Given a capillary tube I
kept
Report
Purpose
The purpose of this lab is to determine the identity of an unknown liquid by measuring its density and its boiling point and try to match it with those solutions given in Table 2 of experiment 2.
Procedure
Part A
In Part A, The main purpose was to find the determination of the density of the unknown (j41) and by doing that we had to determine volumes of the unknown liquid (j41) using three different volumetric devices which are graduated cylinder, pipette and burette. Then we had to perform three measurement trials on each device.
Graduated cylinder: I dried a clean 50.0 ml graduated cylinder and also measured with a balance and I got 66.39g after measuring the empty cylinder I added 15.0ml of the unknown liquid (j41) and measured it and I got 77.65g and I continued adding 15 ml until I had the total liquid in the cylinder to be at 45.0ml and I got 89.30g and
100.72g for my trials at 30.0 ml and 45.0 ml.
Pipette and burette: I weighed a clean dry 150 ml beaker and I saw it was 64.21g and I used a pipette to measure out 10ml of the unknown liquid (j41) and poured it into the beaker and reweighed the beaker which was now 83.22g and i added more 10ml to my 2nd trial and 20ml for my 3rd trial and I got 102.41g and 121.35g respectively. (I accidently used a 25ml pipette which I noticed at the end of the lab so instead of adding 10 ml each into each trial I was adding 25ml).
I filled a burette with the unknown liquid (j41), having an initial burette reading of 0.00ml and by using the burette I was pouring in
13ml of the liquid into the beaker and measuring the mass of the beaker for the 1st trial with 13ml I found its mass to be 74.02g and the
2nd trial with 26ml I found its mass to be 83.95g and on the 3rd trial I found its mass to be 93.68g.
Part B
In the part I clean and dried a 75 ml test tube and added 15 drops of the unknown solution (j41) into the test tube. Given a capillary tube I
kept