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26 January, 01:14

Absorbance readings are taken for five standard ferrous (ii) thiocyanate solutions and a beer's law plot is created with the equation: y = 3.2975x + 0.0021. a ferrous (ii) thiocyanate solution of unknown concentration is found to have an absorbance of 0.31. the cuvette was 1cm wide. what is the unknown concentration according to the above data?

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  1. 26 January, 01:41
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    The Beer's Law plot is a graph of Absorbance data vs Concentration data. The plot is linear which follows the slope-intercept form: y = mx + b, where m is the slope and b is the y-intercept. The y data is the absorbance, and the x data is for the concentration. At the same wavelength, this equation can be used to determine C at a given absorbance. When y = 0.31, then x is

    0.31 = 3.2975x + 0.0021

    Solving for x,

    x = 0.0934

    Thus, the unknown concentration is 0.0934 mol/L.
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