At 580 nm, the wavelength of its maximum absorption, the complex Fe(SCN)^2+ has

Question

At 580 nm, the wavelength of its maximum absorption, the complex Fe(SCN)^2+ has a molar absorptivity of 7.00 times 10^3 L cm^-1 mol^-1. Calculate a. the absorbance of a 4.51 times 10^-5 M solution of the complex at 580 nm in a 1.00-cm cell. Absorbance = b. the absorbance of a solution in which the concentration of the complex is twice that in (a). Absorbance = c. the transmittance of the solutions described in (a) and (b). Transmittance of the solution described in (a) = Transmittance of the solution described in (b) = d. the absorbance of a solution that has half the transmittance of that described in (a). Absorbance =

Explanation / Answer

Q1.

a)

A = e*l*C

A = (7*10^3)(1)(4.51*10^-5)

A = 0.3157

b)

concentration is twice:

A = (7*10^3)(1)(4.51*10^-5)*2

A = 0.6314

c)

A = 2-log(T%)

T% = 10^(2-A)

T% = 10^(2-A)

T% = 10^(2-0.3157) = 48.33 %

T% = 10^(2-0.6314) = 23.36 %

d=

half transmitance as in A

T% = 1/2*48.33 = 24.16%

A = 2-log(T%)

A = 2-log(24.16) = 0.61690

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