The following graph of concentration versus absorbance was created by measuring

Question

The following graph of concentration versus absorbance was created by measuring the absorbance of a solution that contained excess Fe (aq), a smaller amount of NCS (aq), anda small amount of nitric acid. The excess Fe3+ was used to make sure that all of the NCS was consumed, and the acid was added to keep unwanted products from forming. Because excess 3+ Fe "(aq) was used, the concentration of FeNCS "(aq) could be determined and plotted against the absorbance of the solution. If the absorbance of an unknown concentration of FeNCS2 (aq) is 0.470, determine the concentration of FeNCS2 (aq) using the graph. Absorbance vs Concentration y 1000x -0.0071 0.9 0.8 0.7 0.6 g 0.5 0.4 0.3 0.2 0.1 Absorbance Linear (Absorbance) 0.0002 0 0.0006 0 0.0008 0.001 Concentration (M)

Explanation / Answer

Equation is given in the graph, where y = absorbance and x = concentration.

Put y = 0.470 in the equation and calculate the value of x.

0.470 = 1000x -0.0071

x = (0.470+0.0071)/1000 = 0.0004771M

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