Question

question 1 according to the beer - lambert law, absorbance is: a) inversely proportional to the concentration b) directly proportional to the concentration c) directly proportional to the transmittance d) directly proportional to the log of the concentration e) inversely proportional to the length of the cuvette

Explanation:

Beer - Lambert Law formula is \(A = \epsilon l c\), where \(A\) is absorbance, \(\epsilon\) is molar absorptivity (constant for a given substance and wavelength), \(l\) is the path - length (length of the cuvette, constant for a given experiment), and \(c\) is the concentration. As \(A=\epsilon l c\), when \(\epsilon\) and \(l\) are constant, \(A\propto c\) (absorbance is directly proportional to concentration). Transmittance \(T=\frac{I}{I_0}\) and \(A =-\log T\), so \(A\) is not directly proportional to \(T\). Also, from \(A=\epsilon l c\), \(A\) is directly proportional to \(l\) (not inversely) and directly proportional to \(c\) (not to \(\log c\)).

Answer:

B. Directly proportional to the concentration