The absorbance of a standard solution of 2.032 x 10-4 M FeSCN+2 was determined to be 1.086. A...


The absorbance of a standard solution of {eq}2.032 \times 10^{-4} {/eq} M {eq}FeSCN^{+2} {/eq} was determined to be 1.086. A student prepared a solution containing 4.98 mL of 0.00200 M {eq}Fe(NO_3)_3 {/eq} and 3.97 mL of 0.00200 M {eq}KSCN {/eq} in 1.00 mL water. What is the concentration of {eq}FeSCN^{+2} {/eq} if its absorbance at equilibrium was measured to be 0.792?

Beer's Law:

Some chemical species are able to absorb light (electromagnetic radiation) in the ultraviolet and/or visible portions of the spectrum. This light absorbance is granted to a solution throughout its volume, when the species is dissolved as a solute. The light exiting the sample will be of lower intensity than the light entering it, with the resulting light absorbance being proportional to the solute concentration. The linearity is defined for light absorbed at a certain wavelength and this linearity is only maintained within a certain absorbance range.

Answer and Explanation: 1

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The absorbance of light A by the solution can be described by Beer's Law:

{eq}\rm A = \epsilon \times l \times c {/eq}

  • {eq}\epsilon {/eq} is the...

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Beer's Law: Absorbance & Concentration


Chapter 4 / Lesson 5

Beer's law expresses the relationship between light intensity and the concentration of a substance through a formula. Learn the background of light transmittance and absorbance, and how the equation of Beer's law is used in science.

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