Prepare a graph of the concentration versus the absorbance. Be sure to use (0, 0

Question

Prepare a graph of the concentration versus the absorbance. Be sure to use (0, 0) as a point and include the linear fit trendline. Also be sure to use proper labeling and include a title. You will be asked to upload this graph in a different question. Please see "Preparing Graphs" under Lab Safety and Practices in the lab manual.

Table A. Calibration Curve of FeSCN2+ Solutions Solution # Volume of
0.100 M
Fe3+ (mL) Volume of
5.00???10?4 M
SCN? (mL) Volume of water
(mL) Total Volume
(mL) [FeSCN2+?]
(M) Absorbance
at ~470 nm blank 1.00 0.00 5.00 6.00 ------- ------- 1A 1.00 1.00 4.00 6.00 2A 1.00 1.50 3.50 6.00 3A 1.00 2.00 3.00 6.00 4A 1.00 2.50 2.50 6.00 5A 1.00 3.00 2.00 6.00 Equation of Trendline   y =   x + R2 =

Explanation / Answer

Initial concentration of SCN- using formula CiVi = CfVf

where,

Ci = 5 x 10^-4 M

Vi = mL added

Cf = final concentration

Vf = 6 mL

Feed values and we get results,

Solution           Cf (M) of SCN-         [Fe(SCN)]2+ (M)

1A                     8.33 x 10^-5           8.33 x 10^-5

1 mole of SCN- reacts to give 1 mole of Fe(SCN)^2+

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