Jumpt 2/1/2018 1000PM 2142/3/2018 07 56 PM Sapling Learning The folowing standar

Question

Jumpt 2/1/2018 1000PM 2142/3/2018 07 56 PM Sapling Learning The folowing standard curve was made by spectrophotographic analysis of equilibrated solutions of known concentration. You are asked to analyze a FelSCNI solution with an unknown concentrabion and an absorbance value of 0:306 The unknown was analyzed on the samme instrument as the standard curve solutions a the same temperture What is the Fe concentration of the unknown solution? Iron/llI) Thiccyanate Standard Crve 4578.9x 8.0125 Number mol/ L Es OPrevious Gu, up & View Sottor @Chea Amnr ONet

Explanation / Answer

Solution-

y = mx + c comparing with y = 4578.9x + 0.0125

y = absorbance

x = concentration of Fe3+

(delta y) / (delta x) = slope = m = 4578.9

delta y =  absorbance = 0.306

[Fe3+] = (delta x) = (delta y) / m

= 0.306 / 4578.9

[Fe3+] = 6.68 x 10-5 mol/L

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