A solution with unknown [FeSCN 2+ ] gives an absorbance of 0.499. From the infor

Question

A solution with unknown [FeSCN2+] gives an absorbance of 0.499. From the information above, what is the concentration of [FeSCN2+] in this solution?

I'm struggling with this section and I would appreciate if someone could break this down a little further for me. Thanks

A set of standard solutions with known [FeSCN2 ] were created and the absorbance was measured in a spectrophotometer. The following data was obtained Standard A Standard B Standard C Standard D Standard E Standard F [FescN2j in standard solution Absorbance 2.0 x 10 4.0 x 10 6.0 x 10 8.0 x 10 1.00 x 104 4.80 x 10 0.043 0.087 0.125 0.173 0.211 1.050 A plot and trendline were obtained from the data and are given as: Absorbance vs Concentration 1.200 y = 2193·4x-0.0036 R2 = 0.9999 1.000 0.800 0.600 0.400 0.200 0.000 0 0.0001 0.0002 0.0003 0.0004 0.0005 0.0006 Concentration SCN- (M)

Explanation / Answer

y = 2193.4 x - 0.0036

here : y = absorbance

x = concentration

given abosrbance = 0.499

y = 2193.4 x - 0.0036

0.499 = 2193.4 x - 0.0036

x = 2.29 x 10^-4 M

concentration of [FeSCN+2] = 2.29 x 10^-4 M

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