4,5-dihydroxynaphthalene-2,7-disulfonic acid

100%

4,5-dihydroxynaphthalene-2,7-disulfonic acid, 4,5-dihydroxynaphthalene-2,7-disulfonic acid, chromotropic acid

Chromotropic acid is used in the identification of formaldehyde and as colorant. A red color develops in the presence of sulfuric acid and formaldehyde (only formaldehyde).

H315

H319

H335

P261

P264

P271

P280

P302+P352

P304+P340

P305+P351+P338

P312

P321

P332+P313

P337+P313

P362

P403+P233

P405

P501

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Physical characteristics

Molecular mass	320
Density	1.9 kg/m³
Melting point	300 ℃572 ℉573 K
Boiling point	595 ℃1,100 ℉869 K
Partition coeff. (logP)	-1.95

Compound added to the database on June 15, 2021, last modified on August 20, 2022.