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B23459 Calconcarboxylic acid

CAS Number
3-Hydroxy-4-(2-hydroxy-4-sulfo-1-naphthylazo)-2-naphthalenecarboxylic acid
Patton and Reeder's Reagent

Stock No. Size Price ($) Quantity Availability
B23459-09 10g 41.20
B23459-18 50g 131.00
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Calconcarboxylic acid


Chemical Properties

Formula Weight
Melting point
ca 300° dec.
Storage & Sensitivity
Ambient temperatures.
Soluble in water, ethanol, sodium hydroxide and methanol.


Calconcarboxylic acid is used as an indicator for calcium titrations with ethylenediaminetetraacetic acid (EDTA) in the presence of magnesium.


Incompatible with strong oxidizing agents.

Literature References

Indicator for complexometric determination of Ca in the presence of Mg: Anal. Chem., 28, 1026 (1956); Analyst, 106, 227 (1981).

Zhu, Z.; Zhu, X.; Shen, J.; Zhou, A.; Ni, M.; Jin, L.; Cong, W. A new fluorescent quenching method for the determination of phosphoproteins by using calconcarboxylic acid. Electrophoresis 2015, 36 (6), 924-929.

Peng, J.; Dong, N.; Dong, Y.; Pan, Z.; Li, W. Solubility, Metastable Zone Width, and Nucleation Kinetics of Boric Acid in the NaCl-KCl-CaCl2-H2O System. J. Chem. Eng. Data 2015, 60 (11), 3341-3346.

GHS Hazard and Precautionary Statements

Hazard Statements: H315-H319-H335

Causes skin irritation. Causes serious eye irritation. May cause respiratory irritation.

Precautionary Statements: P261-P264b-P271-P280-P302+P352-P304+P340-P305+P351+P338-P312-P332+P313-P337+P313-P362-P501c

Avoid breathing dust/fume/gas/mist/vapours/spray. Wash face, hands and any exposed skin thoroughly after handling Use only outdoors or in a well-ventilated area. Wear protective gloves/protective clothing/eye protection/face protection. IF ON SKIN: Wash with plenty of soap and water. IF INHALED: Remove to fresh air and keep at rest in a position comfortable for breathing. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. Call a POISON CENTER or doctor/physician if you feel unwell. If skin irritation occurs: Get medical advice/attention. If eye irritation persists: Take off contaminated clothing and wash before reuse. Dispose of contents/ container to an approved waste disposal plant

Other References

Harmonized Tariff Code


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    Glycolic acid, 98%
  • A15656

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  • B24279

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