L25 - SUMMARY FROM LAST CLASS Electrochemistry The...

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Dr. P. Lucas U of A MSE 110 Electrochemistry SUMMARY FROM LAST CLASS The stoichiometry and the number of electron transferred during a redox reaction is obtained by balancing reaction equation according to the following principles: A REDOX REACTION IS THE SUM OF TWO HALF-REACTION: AN OXIDATION AND A REDUCTION EACH HALF REACTION MUST BE BALANCED SO AS TO GIVE THE SAME NUMBER OF ATOMS ON EACH SIDE. EACH HALF REACTION MUST BE BALANCED SO AS TO GIVE THE SAME TOTAL CHARGE ON EACH SIDE. THE NUMBER OF ELECTRONS GAINED BY THE OXIDANT MUST BE EQUAL TO THE NUMBER OF ELECTRONS LOST BY THE REDUCTANT.
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Dr. P. Lucas U of A MSE 110 Equilibriums NERNST EQUATION N 2 + 3 H 2 2 NH 3 v 1 v 2 At equilibrium, net ratio of N 2 , H 2 , NH 3 is constant, v 1 = v 2 . N 2 H 2 NH 3 If NH 3 introduced in chamber, the equilibrium is shifted: v 2 >v 1 N 2 + 3 H 2 Å 2 NH 3 If N 2 or H 2 introduced in chamber, the equilibrium is shifted: v 1 >v 2 N 2 + 3 H 2 Æ 2 NH 3
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Dr. P. Lucas U of A MSE 110 Equilibriums CaCO 3 (s) CaO(s) + CO 2 NERNST EQUATION v 1 v 2 Heated CaCO 3 decompose into CaO(s) + CO 2 until pressure builds up and equilibrium is reached, net ratio of CaCO 3 (s), CaO(s), CO 2 is constant, v 1 = v 2 . CO 2 If CO 2 introduced in chamber, the equilibrium is shifted: v 2 >v 1 CO 2 pressure decrease. CaCO 3 (s) Å CaO(s) + CO 2 Precipitation of CO 2 in sea water as CaCO 3.
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Dr. P. Lucas U of A MSE 110 Equilibriums NaCl(s) Na + (aq) + Cl - (aq) NERNST EQUATION v 1 v 2 Excess salt in water doesn’t dissolve and remain as solid in equilibrium, v 2 =v 1 . H 2 O NaCl If the water is boiled out, the concentration of [Na + ] and [Cl - ] increase and the equilibrium is shifted: v 2 >v 1 NaCl(s) Å Na + (aq) + Cl - (aq) Increase in [Na + ] and [Cl - ] drives the reaction consuming Na + and Cl - .
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Dr. P. Lucas U of A MSE 110 Equilibriums NERNST EQUATION v 2 After some time the equilibrium is reached and v 2
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This note was uploaded on 11/19/2009 for the course MSE 110 taught by Professor Lucas during the Spring '08 term at University of Arizona- Tucson.

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L25 - SUMMARY FROM LAST CLASS Electrochemistry The...

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