Chromotropic acid

Chromotropic acid
IUPAC name 4,5-dihydroxynaphthalene-2,7-disulfonic acid[1]
Identifiers
CAS number	148-25-4 Y
ChemSpider	60557 Y
KEGG	C11323 Y
ChEBI	CHEBI:1751 Y
ChEMBL	CHEMBL144298 Y
Jmol-3D images	Image 1
SMILES O=S(=O)(O)c1cc(O)c2c(c1)cc(cc2O)S(=O)(=O)O
InChI InChI=1S/C10H8O8S2/c11-8-3-6(19(13,14)15)1-5-2-7(20(16,17)18)4-9(12)10(5)8/h1-4,11-12H,(H,13,14,15)(H,16,17,18) Y Key: HLVXFWDLRHCZEI-UHFFFAOYSA-N Y InChI=1/C10H8O8S2/c11-8-3-6(19(13,14)15)1-5-2-7(20(16,17)18)4-9(12)10(5)8/h1-4,11-12H,(H,13,14,15)(H,16,17,18) Key: HLVXFWDLRHCZEI-UHFFFAOYAH
Properties
Molecular formula	C10H8O8S2
Molar mass	320.30 g/mol
Acidity (pKa)	5.36, 15.6[2]
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Chromotropic acid has the formula is (HO)₂C₁₀H₄(SO₃H)₂.

It can be used for as a reagent in the quantitative determination of the systemic herbicide, 2,4-Dichlorophenoxyacetic acid.^[3]

The usefulness of this reagent in quantitative determination is the formation of a red colouration (peaking at 580 nm wavelength) when chromotropic acid in 75% sulfuric acid reacts with formaldehyde. The colouration is specific to this aldehyde and is not produced from other organic species such as ketones and carboxylic acids.

References

1. ^ Safety (MSDS) data
2. ^ Dawson, R.M.C., et al., Data for Biochemical Research, Oxford, Clarendon Press, 1959.
3. ^ Plant Physiology Letourneau and Krog 27 (4): 822. (1952)

This article about an organic compound is a stub. You can help Wikipedia by expanding it.v · Categories: 1-Naphthols Naphthalenesulfonic acids Organic compound stubs Wikimedia Foundation. 2010. Игры ⚽ Нужно решить контрольную? Andronovo culture Somena Look at other dictionaries: chromotropic acid — chromotropo rūgštis statusas T sritis chemija formulė (HO)₂C₁₀H₄(SO₃H)₂ atitikmenys: angl. chromotropic acid rus. хромотроповая кислота ryšiai: sinonimas – 4,5 dihidroksi 2,7 naftalendisulfonrūgštis …   Chemijos terminų aiškinamasis žodynas chromotropic acid — noun also chromotrope acid Etymology: International Scientific Vocabulary chromotropic, chromotrope (from chrom + tropic, trope) + acid; originally formed as German chromotropsäure : a colorless crystalline acid C10H4(OH)2(SO3 …   Useful english dictionary chromotropic acid — Used as a reagent and in chromotropes …   Medical dictionary naphthalenedisulfonic acid — “+... noun Etymology: naphthalene + disulfonic : any of several disulfonic acids C10H6(SO3H)2 derived from naphthalene and used especially in the form of hydroxy and amino derivatives (as chromotropic acid, H acid, G acid, R acid) as dye… …   Useful english dictionary chromotrope acid — noun see chromotropic acid …   Useful english dictionary List of organic compounds — This page aims to list well known organic compounds, including organometallic compounds, to stimulate the creation of Wikipedia articles. Note that purely inorganic compounds, minerals, and chemical elements are not included on this list. There… …   Wikipedia chromotrope — Any of several dyes containing chromotropic acid and which have the property of changing from red to blue on afterchroming …   Medical dictionary CTA — Canadian Tuberculosis Association; center for total access; chemotactic activity; chromotropic acid; Committee on Thrombolytic Agents; computed tomography of the abdomen; computed tomographic angiography; congenital trigeminal anesthesia;… …   Medical dictionary χρωμοτροπικός — ή, ό, Ν φρ. «χρωμοτροπικό οξύ» χημ. δικυκλική ή αρωματική οργανική ένωση, πού χρησιμοποιείται ως αντιδραστήριο στην αναλυτική χημεία και αποτελεί ενδιάμεσο κατά την παρασκευή αζωχρωμάτων. [ΕΤΥΜΟΛ. Αντιδάνεια λ., πρβλ. αγγλ. chromotropic (acid)… …   Dictionary of Greek CTA — • Canadian Tuberculosis Association; • center for total access; • chemotactic activity; • chromotropic acid; • Committee on Thrombolytic Agents; • computed tomography of the abdomen; • computed tomographic angiography; • congenital trigeminal… …   Dictionary of medical acronyms & abbreviations 18+ © Academic, 2000-2024 Contact us: Technical Support, Advertising Dictionaries export, created on PHP, Joomla, Drupal, WordPress, MODx. Mark and share Search through all dictionaries Translate… Search Internet Share the article and excerpts Direct link … Do a right-click on the link above and select “Copy Link”