• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Determination of the relative atomic mass of lithium

Extracts from this document...


A-LEVEL CHEMISTRY Assessed Practical 3 (AS) DETERMINATION OF THE RELATIVE ATOMIC MASS OF LITHIUM In this experiment I am going to attempt to determine the relative atomic mass of lithium by means of two different methods. My first method I am going to attempt to see if I can determine the relative atomic mass of Li by measuring how much volume of hydrogen gas produced and then secondly by titrating the lithium Hydroxide produced from my first step I will hopefully a close approximation of the RAM of Lithium. AIM: My aim for this experiment is to see if I can find a close approximation of the relative atomic mass of Lithium by using the volume of hydrogen gas lost and then by titrating the volume of lithium hydroxide I obtain. PREDICTION: My prediction for this experiment is that I hope the relative atomic mass that I am going to get by the end of my two procedures will be above or below the actual RAM of Lithium by not more than 0.1% grams. APPARATUS * 2 of 250cm3 conical flask * Protective goggles * 250 cm3 measuring cylinder * Delivery tube * Clamp stand, a boss and a clamp- for balance * 100 cm3 measuring cylinders, * A burettes / and stands for the burette * Re-weighted Lithium of 0.1g from a Lithium chunk stored in oil * 25cm3 pipette ...read more.


OVERALL OBSERVATION FROM MY RESULTS AND CALCULATION Looking back at my results I can see it looks fairly accurate with not a lot of anomalous results. From the relative atomic mass I obtained from method1: measuring the volume of hydrogen gas given, and Method2 titrating the LiOH, I can see that the RAM obtained from the Method 1 gives more accurate and approximate RAM of Lithium. From method was 6.5g and method 2 was 7.5g but the actual RAM of Li is 6.9g, so I would say that method seems to be more accurate. For method 2 on average the 25cm3 of LiOH I was using required 0.003325cm3 of 0.100mol dm-3 of HCl. Implementation and analysis. When following the procedure for both methods (volume and titration) you have to make sure that safety precaution like wearing goggles and gloves are followed carefully. Also if you have a long hair, you will need to tie it back to avoid contact with chemicals. All the safety precaution should be followed carefully as working with acids and other reactive elements can be dangerous (in this case especially lithium as it can react with the skin due to the skins moisture and also it can react with the atmosphere, so it is better to keep it in oil). ...read more.


lithium because I felt that measuring scale seemed to be giving me irregular sizes even though the measurement seemed to be close however this could be due to the fact that the measuring scale wasn't functioning as well as it could have and I think I should have used a much newer measuring scale and this would probably have made my measurements more accurate and thus get a closer approximation of the mass of lithium. I think that my overall accuracy in both experiment was very accurate as I got a close approximate figure of the mass of the lithium from my calculation, and any limitation that could have prevented me from getting the actual mass of lithium would be that perhaps that of human errors mainly down to me and the state of my measuring equipments. Any improvements that I could suggest for the experiments limitation is to carry out the whole experiment in one day because this will ensure that equipments are constant carry out the experiment using better equipments. I think that my main sources of error and the limitation in both experiments were partly due to faulty in equipments and human errors. Any modification if I could do the test again is to change the equipments I used and try to complete the experiment quickly in order to minimise any human errors. 1 Bakhid Cawaale Centre no: 10266 ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Classifying Materials section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Classifying Materials essays

  1. The rates of reaction between CaCO3 and HCL

    was pure As the CaCO3 is not pure, percentage purity is needed find this by p 44 x 100 = % purity West CaCO3 CO2 100g 44g 5g 0.43g X20 x20 100g 8.6g 8.6 44 x 100 = 19.54545455% = 19.5% (1 dp)

  2. The role of mass customization and postponement in global logistics

    The ability to remain economic while responding to/absorbing change and fluctuations in customer demand with regards to the nature, volume and timing of production outputs; included are flexibility of tools, processes, products, routings, volume * Producing in volume, but at the same time giving each individual customer something different according to his or her unique needs.

  1. Free essay

    Periodic table

    As there is a greater chance of these types of disorders appearing in males it is often called a sex-linked disorder. Mutations Mutations are caused by an alteration to genes. Mutations can occure in a single gene - genetic mutation or in a chromosome -called a chromosomal mutation.

  2. An experiment to investigate the factors that determine the amount of energy released when ...

    This was a suitable amount since it filled the crucible fully and accommodated the correct amounts of alcohols needed. I also had to choose a suitable container to put the water in and suspend above the burning alcohol. This included choosing the correct size and shape.

  1. Determining the Relative Atomic Mass of Lithium.

    Attempt 1 Attempt 2 Attempt 3 Average Amount of H2 produced (cm3) 181 174 178 178 Amount of HCl Titrated (cm3) 33.5 33.1 32.9 33.2 0.1 Mol.dm-3 HCl solution was used. The average result was used, 33.2cm3 of 1.0 mol.dm-3 HCl was titrated to neutralise 25cm3 of LiOH.

  2. The relative atomic mass of lithium

    Test-2 My mission was to find out the atomic mass of lithium. But this time by titrating the lithium hydroxide with HCl. From the solution that I have created in test-1 I pipette 25cm into a conical flask, then 5 drops of phenolphthalein indicator was added.

  1. Determining the relative atomic mass of lithium.

    I used a balance scale to weigh the piece of lithium used which is an accurate equipment and measures to the nearest 0.01g. Hence, the overall accuracy of my equipment would help to produce an accurate final result for my experiment.

  2. Gravimetric Determination of Phosphorus in Plant Food

    the number of moles of HPO42-, - The number of moles of HPO42- is twice the number of moles of P2O5 present in the plant food sample originally. - One can find the mass of P2O5 in the plant food sample by knowing its molecular weight (you figure that one out too).

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work