For data analysis question #2, use your line equation obtained from part II to find the equilibrium concentrations of [FeSCN

^{2+}]. Just plug in your absorption values obtained for each of the test tubes in part III into your line equation, solve for [FeSCN

^{2+}], and record the concentrations in the table provided.

For data analysis question #3, start by multiplying your answer from question #2, the [FeSCN

^{2+}] for say, test tube 1, by the total volume of [FeSCN

^{2+}] (which is 10 mL, but you probably need to use 1.0x10

^{-2}L in your calculation so that the units come out right) to get moles of FeSCN

^{2+}. Next, calculate the moles that you started with of Fe

^{3+} and SCN

^{-} by using the table for mixing given way back on page 5 for the instructions on part III (step #12). Here is an example of how to get the starting moles for Fe

^{3+} for test tube #1:

(.0020 mol/

~~L~~ Fe

^{3+})(3.00x10

^{-3}~~L~~) = 6.0x10

^{-6} mol Fe

^{3+}Next, use the following equation to calculate the final moles of both Fe

^{3+} and SCN

^{-}:

Fe

^{3+} + SCN

^{-} FeSCN

^{2+}final moles Fe

^{3+} = starting mol Fe

^{3+} - mol FeSCN

^{2+}final moles SCN

^{-} = starting mol SCN

^{-} - mol FeSCN

^{2+}Take your final moles of both Fe

^{3+} and SCN

^{-} and divide each by the total volume (1.00x10

^{-2}L) in order to convert them to equilibrium concentrations of each. Report these concentrations in the table provided for each test tube.

data analysis question #4 is easy if you did parts II and III correctly. Use the following formula and just plug in your answers from the previous two questions into the places where they go. Repeat for each test tube:

K

_{eq} = [FeSCN

^{2+}]/[Fe

^{3+}][SCN

^{-}]