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EC number: 203-618-0
CAS number: 108-80-5
The pH dependence of the ultraviolet absorption spectra of aqueous
solutions of cyanuric acid and its chlorinated derivatives is attributed
to dissociation leading to four species containing the cyanuric nucleus
with net charge 0, 1 -, 2- and 3 -. Chlorination of cyanuric acid
results in more diffuse spectra because several species of a given net
charge may exist. At pH 14 the spectra of these solutions are
essentially identical regardless of degree of chlorination and the
principal organic ion present is the triply charged cyanurate. The value
of pK3 of cyanuric acid was estimated from spectral changes to be about
Several sources of literature are available which provide the
dissociation constant of cyanuric acid as follows:
pKa1: = 6.5-7.0
pKa2: = 10 - 11
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