Answer to Question #105960 in Physics for Roopali jha

Question #105960
While using a UV-Vis spectroscopy for concentration of the analyte of 0.11 and 0.21 mM, the absorbance read are 2 and 3 units receptively. What is the concentration if the absorbance read is 2.6 units
1
Expert's answer
2020-03-25T11:01:05-0400

Assuming linear dependence of concentration C on the absorbance A, we can write the linear equation:


CC1C2C1=AA1A2A1, C0.110.210.11=A232,\frac{C-C_1}{C_2-C_1}=\frac{A-A_1}{A_2-A_1},\\ \space\\ \frac{C-0.11}{0.21-0.11}=\frac{A-2}{3-2},

express C(A):


C(A)=0.1A0.09,C(2.6)=0.17 mM.C(A)=0.1A-0.09,\\ C(2.6)=0.17\text{ mM}.

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