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Chemistry - What is the atomic mass of lithium? Method one: The first method involves reacting a known mass of lithium with a known volume of distilled wa

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Introduction

Chemistry - What is the atomic mass of lithium? Method one: The first method involves reacting a known mass of lithium with a known volume of distilled water and measuring the quantity of hydrogen which is produced. I'll do this experiment only once because I am confident with my ability of measuring accurately and any error I performed once, I would no doubt repeat it every time. I will assume throughout that 1mole of the hydrogen I produced occupies 24000cm� at R.T.P Results: From the reaction between 100cm� of distilled water and 0.10g of lithium I collected 158cm� of hydrogen. Treatment of results: I collected 158cm� of hydrogen gas. If one mole of gas occupies 24000cm� the I can find how many moles I have by using Method 2: This second method uses one of the products from the previous experiment and as that is an alkali a titration can determine the concentration of the solution of lithium hydroxide. These are the results I found when I titrated 25.0ml of the unknown concentration of LiOH with 0.100moldm� of hydrochloric acid. 1. ...read more.

Middle

These are obviously not correct as the value found by professional scientists is 6.94 . Many contributing factors are involved in the inaccuracy of my results. In the first method, problems come from many sources, the product, hydrogen, is collected and it passes through water. Some hydrogen may well dissolve into the water. I don't not know how much this effects the outcome but I would say very little, but still, to minimise the effect how the gas is collected has on the results a large gas syringe would be useful. Also being able to measure the quantities of my reactants to a greater degree of accuracy would help. But in total this would have little effect. The majority of error comes from my own error and not being accurate enough with my measuring and one important factor is the fact when placing the bung the point at which the reaction is most violent, the start, some of the hydrogen wouldn't be caught. ...read more.

Conclusion

Hazardous substances: Lithium - Care must be taken, lithium is an highly reactive solid, to extinguish use methods to smother lithium such as limestone or dry clay. During a fire poisonous gases are produced such as lithium oxide. Breathing in lithium particles can cause much distress with shortness of breath and coughing present. Contact with the skin can cause irritation and burns. (Information used from: http://www.state.nj.us/health/eoh/rtkweb/1119.pdf .) Lithium hydroxide - This non explosive substance is extremely corrosive and dangerous to the respiratory system and the same the he digestive system, it causes internal burns on ingestion and external burns on contact with skin. (Information from: http://www.ilo.org/public/english/protection/safework/cis/products/icsc/dtasht/_icsc01/icsc0913.htm.) Hydrochloric acid - Very harmful, there are severe consequence involved in the inhalation of Hydrochloric acid. The acid causes great ad serious discomfort within the respiratory system. Inhalation can causes irritation to the trachea and lungs. Consumption as expected causes vomiting, nausea and diarrhoea. Contact with the skin an cause burning and ulcers. (Information collected from: http://www.epa.gov/ttn/atw/hlthef/hydrochl.html .) ?? ?? ?? ?? ...read more.

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