Question

Beer’s Law Data for Salicylic Acid solutions and construction of the calibration curve:

First, 100. mL of solution containing salicylic acid complexed with Iron (III) nitrate is prepared as follows:

        10.0 mL of the stock salicylic acid solution prepared in Question 1 (above) is transferred to a 100. mL volumetric flask, 10.0 mL of 0.0250 M Fe(NO₃)₃ solution is added, and distilled water is added to the mark, making precisely 100. mL. I am going to call this solution "initial". The molarity of solution #1 in the table below is the same as the molarity of "initial" because we just took 10 mL of it and did not dilute further.

The salicylic acid / iron (III) complex volumes in column 2 of Table II are all taken from the "initial" solution.

The remaining four salicylic acid standard solutions were prepared by diluting varying amounts of the "initial" solution made above (100 mL was made) with water as shown in Table II.    Calculate the concentration (M) of solutions #2, #3, #4, and #5. Enter your answers in the same format used in the example.....do not use scientific notation.....

Table II

Test tube	Volume of Solution salicylic acid / Iron (III) complex (mL)	Total Volume (mL)	Concentration (Molarity)	Absorbance
#1	10.00	10.00	0.000579	0.301
#2	8.00	10.00	Blank 1	0.219
#3	6.00	10.00	Blank 2	0.145
#4	4.00	10.00	Blank 3	0.074
#5	2.00	10.00	Blank 4

Answer 1