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Determination of the relative atomic mass of lithium

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Introduction

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.

Middle

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.

Conclusion

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.

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