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How do you quantitatively measure the colour intensities of different solutions?
Wiki User
∙ 13y ago
This is kind of a tricky question. But if you're wanting to skip to the end, the answer is spectrophotometry. Remember that, when we speak of the intensity of a color, we are talking about the intensity of some beam of light. This intensity is just a measure of the energy deposited by this beam of light on a given area in a given time (normally measured in watts per meter squared). The problem is, when we speak of the "intensity" of the color of a solution, we use "intensity" in its colloquial sense. This "intensity" actually arises from the solution ABSORBING light. Solutions will absorb particular wavelengths of light much more than they will other wavelengths of light. Let's introduce some terms, the definition of which will become clear from the upcoming context.
We have some color: A
and its complementary color: B
Let's say that a solution appears to be A-colored. This is because light passes through the solution, and the solution very effectively absorbs B-colored light. The extent to which the solution absorbs this B-colored light (or the absorbance) depends on the concentration of the solution, and the amount of the solution through which the light travels (path length).
these relationships are governed by the Beer-Lambert Law, which is as follows.
A=ebc
with variables:
A=absorbance (unitless)
b=path length (units of length)
c = concentration
and e=extinction coefficient. (normally units of 1/length * concentration)
The extinction coefficient is experimentally determined for a given solution at a given wavelength.
Spectrophotomers are machines that find the wavelength of peak absorbance and measure that absorbance. They don't come cheap, but you can probably see why this is such an extremely powerful tool.
Wiki User
∙ 13y ago
Wiki User
∙ 9y agoColor is mainly quantified using a spectrophotometer. This will measure the intensity of a color that is present in a solution.
Wiki User
∙ 12y agoYes, it is a qualitative measurement if it is not determined spectrophotometric or compared with color samples.
Wiki User
∙ 11y agoThe wavelength of light which corresponds to the color of said light, can be quantitatively measured, generally in meters.
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