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Doc Brown's
Advanced Chemistry
PART 15.5
Ultraviolet & visible spectroscopy
15.5.3
uv-visible absorption spectra and more on the chemistry of
colour - example of uses and applications explained[Author
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Dr
Phil Brown PhD:
Doc Brown's advanced level organic chemistry exam revision notes
suitable for students of UK A level chemistry courses & US K12 grade 11-12 & AP honors chemistry courses:
Applications of
uv-visible absorption
spectroscopy
[updated
Mar 6th 2026 *]
All my advanced A level chemistry notes
SPECTROSCOPY INDEXES
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15.5.1
The origin of colour, the wavelengths of
visible light, our perception!
15.5.2
uv-visible spectroscopy
theory, spectrometer, examples of absorption & reflectance spectra
explained
15.5.3
uv-visible absorption spectra - index of
examples: uses, applications, more
chemistry of colour (this page)
15.5.3
uv-visible absorption
spectra - index of examples: uses, applications, more on the
chemistry of colour
Sub-index for this page
(a)
More examples
of organic molecule absorption spectra
(b)
More examples
of inorganic uv-visible absorption spectra (mainly transition
metal ion complexes)
(c)
Examples
of applications of uv-visible absorption spectra in chemical analysis and identification
(d)
Examples
of applications of uv-visible absorption spectra in chemical kinetics
(e)
The
analytical uses of flame emission and absorption spectroscopy
(a) More examples of organic molecule absorption spectra
02
The
uv-visible absorption spectra of alkenes
07
The
uv-visible absorption spectra of selected aromatic compounds - arenes
03
The uv-visible absorption
spectrum of chlorophyll, photosynthesis
(porphyrin pigment)
04
The uv-visible absorption spectra
of the photopigments in the human eye
09
The uv-visible absorption spectra
of some acid-alkali titration indicators
11
The uv-visible absorption spectra
of some azo dyes
14
The uv-visible absorption spectra
of some phenols
15
The uv-visible absorption spectrum of
methylene blue
16
The uv-visible absorption
spectrum of haemoglobin
(porphyrin pigment)
17
The uv-visible
absorption spectrum of melanin pigments
(b)
More examples of inorganic absorption spectra (mainly transition metal ion
complexes)
08
The
uv-visible absorption spectra of some copper complex ions
01
The
uv-visible absorption spectra of some cobalt complex ions
05
The uv-visible absorption spectra
of selected titanium complex ions
12
The uv-visible absorption spectra
of selected nickel complex ions
13
The uv-visible absorption spectra
of selected manganese complex ions
06
The uv-visible absorption spectra of
some chromium ions
10
The uv-visible absorption spectra
of the Group 7/17 Halogens
(c)
Examples of applications in analysis and identification
Previously written ....
Identifying and element
analysis from emission spectroscopy and flame photometry
Colorimetric analysis
and determining a transition metal complex ion formula
(d)
Examples of applications in chemical kinetics
A change in reactant or
product concentration can make the basis of studying the rate of
a chemical reaction.
Ideally, a single coloured
reactant changes into a colourless product, or, colourless reactants produce
one coloured product.
The concentration of the
coloured reactant or product can be followed by sampling the
reaction mixture and measuring the absorbance at appropriate
time intervals.
The two graphs above might represent
results for a 1st order reaction.
The graphs assume
(i) Only one reactant
is coloured and forms a colourless product, so
absorbance decreases with time.
(ii) The absorbance is
proportional to the concentration of the coloured reactant.
Graph A represents the
raw data i.e. measuring the absorbance of samples removed
from the reaction mixture - this must be done quickly and
efficiently.
From the graph A data and
a concentration versus absorbance calibration curve you can
then convert absorbance to a concentration to give graph A.
The graph data (and other
sets) can then be analysed just like any other sets of
kinetics data to determine the order of reaction and rate
constant.
You would also have a calibration graph of concentration versus
absorbance to obtain the data for rate analysis and ultimately
the rate equation i.e. rate = k[conentrations]orders
See
Advanced A level
chemistry notes - sections 5. to 7.
colorimetry transition metal
complex
SPECTROSCOPY INDEXES
All Advanced Organic
Chemistry Notes
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