Paracetamol Tablets Which Can Be Used To Calculate The Purity Of Propane
Task 3: M1
I weighed my paracetamol tablets before I started the experiment so I was able to work out the percentage yield and percentage purity. If I never weighed the paracetamol tablets which I used, the calculations wouldn't be accurate. I warmed the two paracetamol tablets with propanone in warm water in order to dissolve the paracetamol and soluble impurities. This then left the undissolved material which I was then allowed me to carry out filtration and remove any insoluble impurities. The propane was then left to evaporate as this removes the solvent through evaporation. Recrystallisation is a way of purifying the solution. In order for soluble purities to form crystals, a high percentage is needed. Whereas, soluble impurities won’t …show more content…
Once the melting point is found, this should be recorded so you can work out the percentage yield. The melting point can also be compared to the real melting point of paracetamol. A wide melting point suggests the sample is not very pure whilst a small number difference suggests the sample is pure.
Task 3: Evaluation
One problem that may occur is that the scales used to weigh the paracetamol at the beginning of the experiment. In order to ensure that they are accurate you should check to make sure they have recently been calibrated. If they have, the scales should be accurate. Before you warm the two paracetamol tablets with propanone in warm water in order to make them dissolve, you should crush the tablets beforehand otherwise it is difficult to get the tablets to dissolve. A good gradient of filter paper needs to be used. If the filter paper is poor quality it will rip easily and you may not realise when you place the filter paper into the funnel. Another problem is that as we left the solutation in a fume cupboard for over a week there’s a high chance of contamination occurring, which would lose mass. When heating the solid in about 10cm3 of water to dissolve it this
I weighed my paracetamol tablets before I started the experiment so I was able to work out the percentage yield and percentage purity. If I never weighed the paracetamol tablets which I used, the calculations wouldn't be accurate. I warmed the two paracetamol tablets with propanone in warm water in order to dissolve the paracetamol and soluble impurities. This then left the undissolved material which I was then allowed me to carry out filtration and remove any insoluble impurities. The propane was then left to evaporate as this removes the solvent through evaporation. Recrystallisation is a way of purifying the solution. In order for soluble purities to form crystals, a high percentage is needed. Whereas, soluble impurities won’t …show more content…
Once the melting point is found, this should be recorded so you can work out the percentage yield. The melting point can also be compared to the real melting point of paracetamol. A wide melting point suggests the sample is not very pure whilst a small number difference suggests the sample is pure.
Task 3: Evaluation
One problem that may occur is that the scales used to weigh the paracetamol at the beginning of the experiment. In order to ensure that they are accurate you should check to make sure they have recently been calibrated. If they have, the scales should be accurate. Before you warm the two paracetamol tablets with propanone in warm water in order to make them dissolve, you should crush the tablets beforehand otherwise it is difficult to get the tablets to dissolve. A good gradient of filter paper needs to be used. If the filter paper is poor quality it will rip easily and you may not realise when you place the filter paper into the funnel. Another problem is that as we left the solutation in a fume cupboard for over a week there’s a high chance of contamination occurring, which would lose mass. When heating the solid in about 10cm3 of water to dissolve it this