pentathionicadj.
/ˌpɛntəθʌɪˈɒnɪk/, U.S. /ˈˌpɛn(t)əˌθaɪˈɑnɪk/ Chemistry.
pentathionic acid n. an unstable polythionic acid having five atoms of sulphur per molecule, H2S5O6, known only in solution.
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pentathionic acid1848
1848 Chem. Gaz. 6 15 Lime behaves towards a solution of pentathionic acid in the same manner as potash.
1881 Nature 28 Apr. 615/2 Mr. V. Lewes..describes..several potassium pentathionates... These experiments appear to establish beyond doubt the existence of pentathionic acid.
1906 H. J. H. Fenton Notes Qualitative Anal. (new ed.) 182 Pentathionic acid is one of the products of the action of SO2 on H2S, under appropriate conditions.
1966 Amer. Statistician 20 32/1 A series of papers..on the mode of action of sulphur and copper fungicides, disposing of the theory that pentathionic acid was responsible for the fungicidal action of the sulphur.
1996 Fuel 75 929/2 It is assumed that the stabilizing compound in this process is pentathionic acid, H2S5O6, which dissociates on the surface and gives rise to a negative charge.
This entry has been updated (OED Third Edition, September 2005; most recently modified version published online March 2022).
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pentathionic
thionic adj.
Brit. /ˌθʌɪˈɒnɪk/
, /ˌθʌɪˈɒnɪk/U.S. /ˌθaɪˈɑnɪk/
in thionic acids, group name for the acids represented by the formula H2SnO6, where n = 2, 3, and perhaps 6 (these acids are called dithionic, trithionic, tetrathionic, pentathionic, and hexathionic acid)./ˌθaɪˈɑnɪk/ΘΚΠ
the world > matter > chemistry > chemical substances > acids > [noun] > acids-named > containing sulphur > thionic acid
thionic acids1880
1880 Jrnl. Chem. Soc. 37 593 A qualitative reaction, by which pentathionic acid is clearly distinguished from any other of the thionic acids.
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adj.1848as lemmas