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Carbon chemistry

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Introduction

Introduction This experiment was conducted to find out the relative atomic mass of lithium. To ensure that the experiment was accurate I will use two different methods and if they are within 0.1 of each other I can be quite certain that my results are accurate. For the first method I will measure the volume of hydrogen when a known mass of lithium reacts with water. The second one will be a titration of the lithium hydroxide made in the first method. For this experiment I will be using * Lithium * 100cm3 distilled * 250cm3 measuring cylinder * 250cm3 conical flask * Stand * Plastic bowl Method: 1) I will clean all equipment with distilled water. 2) I will set up my equipment properly so that the plastic bowl and cylinder have sufficient water in them. 3) I will clean the lithium to remove excess oil and cut it to the required mass. ...read more.

Middle

a titration this will allow me to find out how much lithium hydroxide will need to be used to neutralise HCL this experiment will be repeated 3 times so that results are accurate. For this experiment I will be using LiOH from the first experiment HCl (100 mol-1) Phenolphthalein 250cm3 conical flask Pipette 100cm3 Burette 100cm3 Funnel 1) Set up the equipment as shown above 2) Using a pipette, drain 25cm3 of solution and place it into the 250cm3 conical flask. 3) Fill the burette with 100cm3 of HCl 4) Add 2 drops of Phenolphthalein to the LiOH 5) Add HCl from the burette one drop at a time until the LiOH becomes clear 6) Take a measurement of how much HCL was used 1 2 3 Final Volume 36.4 32.3 32.2 Initial Volume 0 0 0 Titre/ cm3 36.4 32.3 32.2 On average 25cm3 of LiOH needed 33.63cm3 of 0.100moldm HCl to neutralise Moles = Concentration X Volume Moles = 0.100 X (33.63cm3 �1000) ...read more.

Conclusion

If I had been able to use a bigger sample of lithium then the surface area would have been smaller and there would have been less oil on the sample making the mass more accurate and also the overall results. Also I could try and clean the lithium more thoroughly and store it in an area where it can avoid oxidation. As I cannot be sure if any residue had been left on the equipment from previous experiments, in the future I will make sure that all equipment has been thoroughly sterilised before I use the equipment. Improving the scale of the experiment will in the future allow me to have more accurate results, for example if I had used equipment that was more accurate than 1 decimal point it would allow smaller errors in the results, but using the schools equipment it was not possible. Rojoni S Ahmad 12Q Chemistry Coursework Page 1 ...read more.

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