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Names | |
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Other names
Hydroxynaphthol blue
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Identifiers | |
3D model (JSmol)
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ChemSpider | |
ECHA InfoCard | 100.058.343 |
PubChem CID
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UNII | |
CompTox Dashboard (EPA)
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Properties | |
C20H11N2Na3O11S3 | |
Molar mass | 620.46301 g/mol |
Appearance | Black-violet Powder |
Soluble | |
Acidity (pKa) | 6.44, 12.93[1] |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Hydroxynaphthol blue is an azo dye. It is used for determining the endpoint in complexometric titrations/Metal Titration.
References
[edit]- ^ Atuko Itoh; Keihei Ueno (1970). "Evaluation of 2-hydroxy-1-(20hydroxy-4-sulpho-1-naphthylazo)-3-naphthoic acid and hydroxynaphtol blue as metallochromic indicators in the EDTA titration of calcium". Analyst. 95 (1131): 583–589. Bibcode:1970Ana....95..583I. doi:10.1039/an9709500583. ISSN 1364-5528.