Why copper sulphate is blue in colour

You can actually watch a chemical reaction take place -- mix two things together, each of which has no color, and watch some colored liquid form.

In dehydrated copper sulphate there are no copper ions free, the copper is ionically bonded to the sulphate. Why the copper is blue in color? This is the question given to me on which I am having seminar I should explain it for minutes in front of all. Hi Akansha. I'm afraid your lecture on this topic will be excruciating for you and the listeners if you don't put effort into it. Please read the page, ask a followup question, and engage us in a practice run for your lecture :- Alternately, look up "black body radiation", study it a bit, and I'm betting you'll deliver a fascinating minutes!

Good luck, and Regards,. The oxidation state refers to how many electrons an atom has gained or lost compared to its neutral state. With one or two or three electrons missing the available energy states empty electron shells are different and the electron energy transition jumping to a lower energy state and emitting a photon of a specific wavelength that is the primary contributor to the observable color will be different.

Thanks Ray. It may be beyond Akansha's pay grade, I know it's beyond mine, but this funny business about the color of glowing metals is what forced Max Planck, completely against his will and contrary to his sense of logic, to drag the whole damn world into the wacky age of quantum mechanics :- Regards,.

Why mercury subchloride and mercuric perchloride are white in color and red sulphate of mercury in red color, but these three compounds are derived from mercury?

Hi Suganya. Please try your best to detail what you understood and didn't understand from the previous discussion so we can keep moving forward. A deep blue copper sulphate solution turns pale blue when water is added. Name and describe the phenomenon which causes the change in colour from deep blue to pale blue. Sorry, Loreal, but I can't get my brain going 'til I've had a proper morning coffee, and I think my wife made the pot with 1 scoop of ground coffee instead of 6.

It tastes like dishwater and looks very pale from dilution as well. I'll be back after I make a fresh pot of strong, deep black, coffee :- Regards,. This is because of the Jahn-Teller effect, because the electrons crowd each other. Hi Lorial The amount of light that passes through a solution the colour you see depend upon the concentration of the solution. The more dilute the solution by adding water the more light in this case blue that passes and the colour is lighter.

This can be used to measure the concentration. I suggest that you do a search on "Beer's Law" and "Absorption spectroscopy" for a more detailed explanation. Dear sirs, I have problem in copper blue colour in aluminium chloride please give me method to removal of blue color from aluminium chloride.

SOOO I am busy doing my homework and the first question they asked me was what the original colour for copper chloride solution and I said blue, sooo then for question 2 they asked explain the colour of the solution, sooo what must I write down for the answer? I really need help ASAP. Hi Chasity. In one sense, all of the explanations here are fine because the actual reason that copper chloride is blue is the same for you as it is for anyone else in the world whether they be kindergarteners or post-docs.

The other three, by contrast, have decreased energy and are called the t2g orbitals. A photon of light will be absorbed by the coordination complex if it has an energy equivalent to the difference between the state an electron now occupies and the energy of another state available to it. Consequently, the copper sulfate complex can absorb photons of light with energies equivalent to the difference in energy between t2g and eg orbitals. As it happens, the difference in energy for the copper sulfate complex is equivalent to the difference in energy for photons of light in the red-orange region of the spectrum.

Since reddish light is absorbed while blue light is transmitted, the copper sulfate appears blue. When the copper sulfate dissolves in water, the copper and sulfate ions dissociate. Now the copper ion forms an octahedral complex where it's surrounded by six molecules of water. The effect is still very much the same, however, because the split between t2g orbitals and eg orbitals in this new complex is still such that reddish-orange light is absorbed and you see a blue-colored solution.

Based in San Diego, John Brennan has been writing about science and the environment since How to Find the Lattice Energy of a Compound. How to Calculate the First Ionization Energy of the It gives out green light. Skip to main content. Earth Science. Articles Answers to Science Questions Why do copper compounds come in different colours? Why do copper compounds come in different colours? Part of the show Naked Evolution.

Play Download. Answer Dr Peter Wothers, Department of Chemistry, University of Cambridge:Metals in general reflect all of the light energy that comes on to them but copper doesn't reflect all of them.

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