3ss01-713633818

3ss01-713633818 - Experiment 3: Spectrophotometric...

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Experiment 3: Spectrophotometric determination of the pKa of the Acid-Base Indicator Bromothymol Blue Neel Parikh Lab Partner: Andrew Nguyen June 1, 2008 Meredith Turner Chemistry 241L, Section 403, Room 400 Pledge:__________________________ Results and Calculations:
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The purpose of this experiment was to use a spectrophotometer to determine the pKa value of the Acid-Base indicator Bromothymol Blue as indicated in the title of the experiment. Bromothymol blue turns a yellow color in its acidic form, and blue in its basic form. In the first part of the experiment, a spectra was created for Bromothymol blue by measuring the wavelength of the compound in its acidic and basic forms for the range 340-800 nm. The data collected for the acidic and basic forms of Bromothymol blue is shown below in data table 1: Wavelengt h Absorbanc e Absorbanc e (nm) pH 10.00 pH 5.00 Basic Acidic 799 -0.062 -0.043 798 -0.062 -0.043 797 -0.062 -0.043 796 -0.062 -0.043 795 -0.062 -0.043 794 -0.062 -0.043 793 -0.062 -0.042 792 -0.062 -0.043 791 -0.061 -0.043 790 -0.061 -0.043 789 -0.061 -0.042 788 -0.062 -0.043 787 -0.061 -0.043 786 -0.061 -0.042 785 -0.062 -0.042 784 -0.061 -0.042 783 -0.061 -0.042 782 -0.062 -0.042 781 -0.062 -0.042 780 -0.062 -0.043 779 -0.061 -0.042 778 -0.061 -0.042 777 -0.061 -0.042 776 -0.061 -0.042 775 -0.061 -0.042 774 -0.061 -0.042 773 -0.061 -0.042 772 -0.061 -0.042 771 -0.061 -0.042 770 -0.061 -0.042 769 -0.061 -0.042 768 -0.061 -0.042 767 -0.061 -0.042
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766 -0.061 -0.042 765 -0.061 -0.042 764 -0.061 -0.042 763 -0.061 -0.042 762 -0.061 -0.042 761 -0.061 -0.042 760 -0.061 -0.042 759 -0.061 -0.042 758 -0.061 -0.042 757 -0.061 -0.042 756 -0.06 -0.042 755 -0.06 -0.042 754 -0.06 -0.042 753 -0.06 -0.042 752 -0.06 -0.042 751 -0.06 -0.042 750 -0.06 -0.042 749 -0.06 -0.042 748 -0.06 -0.042 747 -0.06 -0.042 746 -0.06 -0.042 745 -0.06 -0.042 744 -0.06 -0.042 743 -0.06 -0.042 742 -0.06 -0.042 741 -0.06 -0.042 740 -0.059 -0.042 739 -0.059 -0.042 738 -0.059 -0.041 737 -0.059 -0.042 736 -0.059 -0.042 735 -0.059 -0.042 734 -0.059 -0.042 733 -0.059 -0.042 732 -0.059 -0.042 731 -0.058 -0.041 730 -0.059 -0.042 729 -0.058 -0.041 728 -0.058 -0.041 727 -0.058 -0.041 726 -0.058 -0.042 725 -0.058 -0.041 724 -0.057 -0.042
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723 -0.057 -0.042 722 -0.057 -0.041 721 -0.057 -0.041 720 -0.056 -0.042 719 -0.056 -0.041 718 -0.056 -0.041 717 -0.055 -0.041 716 -0.055 -0.041 715 -0.055 -0.041 714 -0.054 -0.041 713 -0.054 -0.041 712 -0.054 -0.041 711 -0.053 -0.041 710 -0.052 -0.041 709 -0.052 -0.041 708 -0.051 -0.041 707 -0.05 -0.041 706 -0.049 -0.041 705 -0.049 -0.041 704 -0.048 -0.041 703 -0.047 -0.041 702 -0.046 -0.041 701 -0.046 -0.041 700 -0.045 -0.041 699 -0.043 -0.041 698 -0.042 -0.041 697 -0.041 -0.041 696 -0.04 -0.04 695 -0.038 -0.04 694 -0.037 -0.041 693 -0.035 -0.04 692 -0.033 -0.04 691 -0.031 -0.04 690 -0.029 -0.04 689 -0.027 -0.04 688 -0.025 -0.04 687 -0.022 -0.04 686 -0.019 -0.04 685 -0.017 -0.04 684 -0.014 -0.04 683 -0.011 -0.04 682 -0.007 -0.04 681 -0.004 -0.04
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680 0 -0.04 679 0.005 -0.039 678 0.009 -0.039 677 0.014 -0.039 676 0.019 -0.039 675 0.024 -0.039 674 0.03 -0.039 673 0.036 -0.039 672 0.041 -0.039 671 0.048 -0.039 670 0.055 -0.038 669 0.063 -0.038 668 0.071 -0.038 667 0.079 -0.038 666 0.088 -0.038 665 0.096 -0.038
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This document was uploaded on 11/04/2011 for the course CHEM 241 at UNC.

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3ss01-713633818 - Experiment 3: Spectrophotometric...

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