Experiment 16 etermination of an Equilibrium Constant Objectives To calculate th

Question

Experiment 16 etermination of an Equilibrium Constant Objectives To calculate the equilibrium constant for the reaction of iron(II) and thiocyanate To determine which reaction is correct by use of the equilibrium constant . To understand Le Chatelier's Principle Prior Reading Appendix C: Spectroscopy Chemistry: The Central Science Visible Spectroscopy and Operation of Spectronic 20 Section 15.2: The Equilibrium Constant pp. 614-618 Section 15.5: Calculating Equilibrium Constants pp. 625-626 Introduction Although it is frequently assumed that many chemical reactions go to completion, in fact all reactions proceed toward an intermediate state called the equilibrium state. It is a dynamic state characterized by the fact that the concentrations of reactants and products no longer change with time. At a given temperature, a system at equilibrium obeys the Experiment 16-1

Explanation / Answer

The following table is as per the given data. only calculations are done here.

Equilibrium concentration

Equilibrium number of moles Tube Fe(SCN)+2 Fe+3 SCN- 1 0.15 * 10-6 9.85 * 10-6 1.7 * 10-6 3 0.26 * 10-6 9.75 * 10-6 5.48 * 10-6 5 0.55 * 10-6 9.45 * 10-6 8.9 * 10-6

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