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03MANKeq - Chemical Equilibrium Revised CHEMICAL...

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Chemical Equilibrium Revised: 4/21/10 1 CHEMICAL EQUILIBRIUM: CALCULATING K C Adapted from "Chemistry with Computers" Vernier Software, Portland OR, 1997 & from “Journal of Chemical Education” Vol. 75, No. 12, December 1998 http://jchemed.chem.wisc.edu/Journal/Issues/1998/Dec/abs1628.html OBJECTIVES For you, the student, to write…. SAFETY PRECAUTIONS Safety goggles and aprons must be worn at all times. Part B: Potassium thiocyanate is moderately toxic by ingestion; emits toxic fumes of cyanide if strongly heated or in contact with concentrated acids. Iron(III) nitrate is a strong oxidizer; skin and tissue irritant. Nitric acid is corrosive and can cause burns. INTRODUCTION When Fe 3 + and SCN are combined, equilibrium is established between these two ions and their product, the FeSCN 2 + ion: Fe 3 + (aq) + SCN (aq) FeNCS 2+ (aq) (1) (Note: The thiocyanate ion acts as a isothiocyanate ligand to Fe 3+ , in other words, the iron binds to the nitrogen atom of the ligand not the sulfur atom. This is the reason that the order of SCN is
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