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Titration is used in neutralisation reactions:

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Introduction

ANALYSING Titration is used in neutralisation reactions: However, this method is also used to find the morality of acids and alkaline. In this investigation I have used titration to find out how much acid (HCl) is needed to neutralise the alkali (Lithium hydroxide-LiOH), thereafter using this number to find the relative atomic mass of lithium. The relative atomic mass of a substance varies from substance to substance. This number is used so that the masses of atoms, of elements could be compared. The symbol used is (Ar). A mole is the mass of a substance that has the same number of atoms as there are in 12g of carbon 12. The number of atoms in one mole is known as "Avogadro's constant", and has a value of 6.02 x 10��mol �. Procedure (1): I will assume that (1) mole of gas occupies 24000cm� at room temperature and pressure. ...read more.

Middle

was accurate as the relative atomic mass found is similar to the average mass shown on the periodic table, 6.9. It is important that my answer lies between the range of 6.9 and 7.9 otherwise it will bare the relative atomic mass of another element. I have written my answers to (2) decimal places initially as some calculation gave me answers such as (0.0) when I wrote them to (1) decimal place. This means that they would have been mathematically incorrect. However my final relative atomic mass of lithium has been written to (1) decimal place, as the measuring cylinder that I used did not have accurate intervals. I have used the complete numbers in my calculations so that my final results will be to a high degree of accuracy. ...read more.

Conclusion

* The number of moles of LiOH present in 100cm� of the solution: In procedure (1) I used 25 cm� of the solution; this indicates that I will have to multiply my answer above by (4) to reach 100cm�. = 0.0315667 x 4 = 0.1262667 mol = 0.13 mol (2dp) * Using these values and the original mass of lithium the relative atomic mass is: Relative Atomic Mass = Mass / Moles of lithium = 0.10 / 0.1262667 = 7.91974648 = 7.92 (2dp) In this procedure all my answers have been written to (2) decimal places as the equipment I used was more accurate and had a higher degree of accuracy. From these results I can draw the conclusion that lithium has a relative atomic mass of 7.8 and 7.9. Although the periodic table suggests that lithium has a relative at9omic mass of 6.9 I believe that different masses of lithium will have a difference in relative atomic mass. ...read more.

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