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Lab 1.docx

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September 24 2013Experiment 1 Determination of the Composition of an AlloyIntroductionSince the dawn of humanity metal alloys have often been mysteries their composition was usually unknown One of the first naturallyoccurring alloy discovered by man was meteoric iron a mixture of nickel and iron This iron meteorite was used for many things including tools weapons and even jewelry Although man has been using this alloy for thousands of years its composition was not discovered until the mid1900s There are a number of ways that scientists could have come to this finding but for the purpose of this lab the composition of an alloy will be determined through the usage of mole ratios which compare to a product of the reactionWhen an alloy or any metal for that matter reacts with an acid hydrogen gas is formed as a product The amount of hydrogen formed is directly relative to the initial amount of alloy This is known as stoichiometry the relation between reactants and their products which in this case is the initial metal or alloy and the hydrogen gas producedFor the first part of the experiment magnesium a metal was reacted with hydrochloric an acid The equation for this reaction isMg 2HClMgClH1s aq2aq2gSince the reaction took place in an aqueous solution a net ionic equation can be formed2Mg 2HMgH 2s aqaq2gStoichiometry uses the relations between reactants and their products by relating their amounts measured in mol This can be done through the comparison of their mole ratios which are the coefficients found before the reactant or product in the net ionic equation For instance for every mole of magnesium reacted one mole of hydrogen gas was formed Using these ratios one can determine the amount of metal reacted based on the amount of hydrogen produced through a series of equations that an determine the amount of hydrogen produced and comparing this value to the amount of magnesium produced Some of these equations includeThe pressure of a water column which describes the pressure of a water column relative 23to its height m h gravitational force 98 ms g and density of water 1000 kgm dPdgh 3water column
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