The following standard curve was made by spectrophotographic analysis of equilib

Question

The following standard curve was made by spectrophotographic analysis of equilibrated Iron(II) thiocyanate solutions of known concentration. You are asked to analyze a Fe(SCN)2+ solution with an unknown concentration and an absorbance value of 0.254. The unknown was analyzed on the same instrument as the standard curve solutions at the same temperature. What is the Fe3 concentration of the unknown solution? Iron(II) Thiocyanate Standard Curve 1.0 y- 4500.9x +0.0307 Number Absorbance 0.5 Fe]-D 3 + mol/ L 0,0001 Fe Concentration (M) 0.0002

Explanation / Answer

Absorbance y = 0.254

Concentration of Fe3+ = x

The given equation

y = 4500.9x + 0.0307

0.254 = 4500.9x + 0.0307

0.254 - 0.0307 = 4500.9x

x = 4.96 * 10^-5 M

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