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Unformatted text preview: The way we found K for each solution was to find the initial concentrations of Fe3+, SCN-, and Fe(SCN)2+, then to determine x by using the equation for the trend line on our calibration graph. From there we found the final concentration or equilibrium concentration for each reactant and product by either subtracting or adding as appropriate. Finally we plugged the numbers to the equation like so: K = [Fe(SCN)2+ + x] / ([Fe3+ - x] * [SCN- - x]). The balanced equation for this experiment is Fe3+ + SCN- Fe(SCN)2+. Possible sources for error in this lab could have been variations in the actual concentrations of the substances. Because they were already prepared, there might have been different concentrations than what was given. Another source of error could have been the spectrophotometer and its accuracy....
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