2. [-140 Points] DETAILS MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER You are testing a newly discovered pH indicator which has a Ke of 3.2 x 10-6. You carefully prepare a solution of 0.0026 M indicator solutions of 0.5 M HCI, 0.5 M NaOH, and in unknown solution A. Then you put an undetermined amount of indicator into unknown solution B. You measure the visible absorption spectra of each of the four solutions. The data is illustrated in the graph and given in the table. 1.2 1.0 Absorbance -- 0.5 M Ha ... 05 M NaOH --Sol A Sol 0.8 0.61 0.4 0.2 450 650 500 550 600 Wavelength (nm) What is the pH of solution A, which contains 0.0026 M indicator? What is the pH of solution B, which contains an undetermined amount of indicator? 0.480 0.344 0.68 (nm) ABS acid ABSbase ABS soln A ABSsoin B 400 0.196 0.178 0.193 0.162 410 0.262 0.178 0.245 0.184 420 0.345 0.179 0.313 0.212 430 0.443 0.184 0.393 0.247 440 0.549 0.191 0.286 450 0.653 0.202 0.566 0.326 460 0.742 0.218 0.640 0.364 470 0.803 0.239 0.694 0.396 480 0.828 0.267 0.719 0.420 490 0.813 0.302 0.713 0.434 500 0.761 0.440 510 0.682 0.393 0.626 0.441 520 0.588 0.448 0.561 0.440 530 0.491 0.508 0.494 0.442 540 0.403 0.571 0.435 0.447 550 0.329 0.634 0.388 0.457 560 0.273 0.694 0.355 0.472 570 0.234 0.747 0.334 0.489 580 0.210 0.792 0.323 0.505 590 0.197 0.824 0.319 0,519 600 0.192 0.842 0.318 0.527 610 0.192 0.844 0.319 0.528 620 0.195 0.830 0.318 0.521 630 0.200 0.800 0.316 0.506 640 0.205 0.755 0.312 0.484 650 0.211 0.699 0.306 0.454