Question

Explain Beer-Lambert's Law. Write down the possible electronic transitions in a molecule.

Explain Beer-Lambert's Law. Write down the possible electronic transitions in a molecule.

Homework Answers

Answer #1

Beer- Lambert's law gives a relation concerning the absorption of radiant energy by absorbing medium. There is a linear relationship between absorbance and concentration of an absorbing species. This law is used to calculate the results of spectroscopic experiments.

This law is a combination of two laws - 1). Beer's law . 2). Lambert's law.

Let I​​​​​​o be the light incident to material and I be the transmitted light.

This means, absorbance (A) = log( Io/I)

and transmission (T) = 1/A

Lambert's law:

The absorbance of light in homogeneous solution is directly proportional to the length of sample through which light passes.

A = € L

where L is the length of the path travelled by light.

€ is molal extinction coefficient

Beer's law:

It states that the absorbance of light in homogeneous solution is directly proportional to the concentration of solution (C) through which it passes.

A= € C

Combining both laws, A= log (I​​​​​​o/I) = €CL

The electronic transitions in a molecule takes place when electrons in a molecule get excited from a lower energy state to a higher energy state.

In a molecule, the type of electronic transitions depends on the type of electrons in a molecule and the energy that can be supplied at a particular wavelength. Out of the two molecular orbitals produced, one is the bonding orbital (lower energy orbital where two electrons will occupy the bonding orbital in ground state configuration) and the other is the antibonding orbital ( higher energy orbital where one electron in the electronically excited molecule occupies the orbital).

The possible transitions are shown below.

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
For Predicting the electronic absorption spectrum of the C60 molecule [ The fullerene known as a...
For Predicting the electronic absorption spectrum of the C60 molecule [ The fullerene known as a Buckyball, named after American inventor R. Buckminster Fuller ], which of the following models would you expect to provide the best prediction of the first three transitions, and why? Particle on a ring, rigig rotor, harmonic oscillator, particle in a box.
Explain whether beer law method could or could not be used to determine the concentration of...
Explain whether beer law method could or could not be used to determine the concentration of a NaCl solution.
2. Consider nitrogen molecule N2 and nitrogen monoxide molecule NO. a) Write down ground state molecular...
2. Consider nitrogen molecule N2 and nitrogen monoxide molecule NO. a) Write down ground state molecular term symbol(s) for each of the molecule. b) Why there are two molecular term symbols for NO and only one for N2.
10) Write the electronic configuration of the V2+ ion. (ii) What are the possible values of...
10) Write the electronic configuration of the V2+ ion. (ii) What are the possible values of the total spin quantum numbers S and MS for this ion?
Consider an atom whose electronic configuration is 3d2 . (a) What are the possible terms and...
Consider an atom whose electronic configuration is 3d2 . (a) What are the possible terms and levels, ignoring the Pauli principle? (b) What are terms and levels from (a) that are allowed if Pauli principle is taken into account? (c) What are the lowest energy term and the lowest energy level? (d) Write down the complete electronic wavefunction (angular and spin parts only) for the state in (b) with the largest L, J, and MJ .
Write down Divergence law in integral form: o Derive the differential form of Divergence law from...
Write down Divergence law in integral form: o Derive the differential form of Divergence law from the integral form by using a integral form
Quantum structure of Helium (two-electron) atom. Write down electronic configurations of the ground state and of...
Quantum structure of Helium (two-electron) atom. Write down electronic configurations of the ground state and of all excited states in the n = 2 manifold, and it's energy.
Calculate the extinction coeffiction (ε, absorptivity) of each compound using Beer-Lambert's Law ; A = εbc....
Calculate the extinction coeffiction (ε, absorptivity) of each compound using Beer-Lambert's Law ; A = εbc. Because of the small amount of material used, you get 2 significant figures. A = absorbance ε = absorptivity b = path length (1 cm) c = concentration (moles/L) My masses were 1.9mg (1), 2.3mg (2) and 2.1mg (3). The MW were 572.53 (1) , 486.35 (2) and 512.39 (3) . The max wavelength were 483.5nm = 0.452 (1) , 583 nm = 0.772...
The Cr4+ ion has an electronic configuration of [Ar]3d^2 . Write down the allowed angular momentum...
The Cr4+ ion has an electronic configuration of [Ar]3d^2 . Write down the allowed angular momentum states in term symbols for the 3d4p excited state configuration of the Cr4+ ion.
Write down a conservation law that should always hold for collisions. What quantity should be the...
Write down a conservation law that should always hold for collisions. What quantity should be the same before and after any collision? Express in proper mathematical notation.
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT