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The Determination of an Equilibrium Constant.
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| Submitted: Thu Sep 18 2003
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The Determination of an Equilibrium Constant Introduction: PARTI: Theory Many chemical reactions are irreversible reactions, for example, if magnesium is burnt in air a brilliant white flame is observed as the white powdery solid magnesium oxide is formed: 2Mg(s) + O2(g) 2MgO(s) We also say that the reaction goes to completion (as Fig. 1 shows), and for practical purpose it is. Some apparently irreversible reactions are reversible to such a small extent that we can ignore it. Concentration Reaction stops when concentration reaches zero Time Fig. 1 A reversible reaction is one that can take place in both directions and so is incomplete (thus this symbol is used). Take the reaction between hydrogen and iodine for example: H2(g) + I2(g) 2HI(g) 0.5 moles of hydrogen gas and 0.5 moles of iodine gas react in sealed glass bulbs and the temperature is kept constant at 445 °C. One may assume that there would be 0.1 mole of...
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