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28 January, 19:10

An unknown solution of triiodide registers an absorbance of 0.782 at 362 nm. A series of triiodide solutions of known concentration were analyzed at this wavelength and a standard curve was created. The equation of the best fit line from the standard curve was determined to be A = (3.2 x 10^-1 M^-1) c, where A = absorbance and c is the concentration of the solution. The constant value in this equation is the value of el. What is the concentration of the triiodide in the unknown solution?

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  1. 28 January, 20:18
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    The standard curve was done at the wavelength of 362 nm for uniformity. We can use this function to determine the concentration at any absorbance value. At A = 0.782, c is,

    A = (3.2 x 10^-1 M^-1) c

    0.782 = (3.2 x 10^-1 M^-1) c

    c = 2.44 M

    The concentration of the triiodide solution is 2.44 M.
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