5:58 PM 28% ooooo T-Mobile LTE organic.cc.stonybrook.edu The data for the absorb

Question

5:58 PM 28% ooooo T-Mobile LTE organic.cc.stonybrook.edu The data for the absorbance measurements of the reaction mixture at 498 nm (the analytical wavelength of the dye) is given below. Initial readings for both runs were taken at approximately t 20 s after mixing. Additional readings were then measured approximately every 120 s (for the lower concentration of OH and approximately every 60 s (for the higher concentration of OH Data for Run 1 Time (s) Absorbance 144 1.257 134 0.991 0.613 0.414 507 0.284 0.208 737 0.126 0.091 Data for Run 2 Time (s) Absorbance 149 194 314 This data produced the plots below.

Explanation / Answer

For Run 2,

8 ml of 1 M NaOH added to 100 ml of total solution volume

Thus,

concentration of NaOH at t = 0

= mmol of NaOH/total solution volume

= 1 M x 8 ml/(50 + 50)ml

= 0.08 mol/L

= 8.00 x 10^-2

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