Calconcarboxylic acid
Synonym(s):2-Hydroxy-1-(2-hydroxy-4-sulfo-1-naphthylazo)-3-naphthoic acid;3-Hydroxy-4-(2-hydroxy-4-sulfo-1-naphthylazo)naphthalene-2-carboxylic acid;Patton and Reeder’s reagent
- CAS NO.：3737-95-9
- Empirical Formula: C21H14N2O7S
- Molecular Weight: 438.41
- MDL number: MFCD00004078
- EINECS: 223-117-0
- SAFETY DATA SHEET (SDS)
- Update Date: 2024-07-14 20:44:35
What is Calconcarboxylic acid?
Chemical properties
dark violet powder
The Uses of Calconcarboxylic acid
Calconcarboxylic acid is used as an indicator for calcium titrations with ethylenediaminetetraacetic acid (EDTA) in the presence of magnesium.
What are the applications of Application
Calconcarboxylic acid is a dye used with EDTA in the presence of mg as an indicator of calcium titrations
Purification Methods
Purify it via its p-toluidinium salt, viz: dissolve the dye in warm 20% aqueous MeOH, treat with an equivalent of p-toluidine and cool to precipitate the salt. Finally recrystallise the acid from hot water. [Itoh & Ueno Analyst (London) 95 583 1970.] It is an indicator and complexes with Ca2+ in presence of Mg2+ and other metal ions [Patton & Reeder Anal Chem 28 1026 1956, Prentoe & Prentoe Analyst 106 227 1981].
Properties of Calconcarboxylic acid
| Melting point: | 300 °C(lit.) |
| Density | 1.60±0.1 g/cm3(Predicted) |
| form | Powder |
| pka | -0.50±0.40(Predicted) |
| color | Very dark purple to black |
| Odor | Odorless |
| Water Solubility | slightly soluble |
| BRN | 727492 |
| Stability: | Stable. Incompatible with strong oxidizing agents. |
| CAS DataBase Reference | 3737-95-9(CAS DataBase Reference) |
| EPA Substance Registry System | 2-Naphthalenecarboxylic acid, 3-hydroxy-4-[(2-hydroxy-4-sulfo-1-naphthalenyl)azo]- (3737-95-9) |
Safety information for Calconcarboxylic acid
| Signal word | Warning |
| Pictogram(s) |
 Exclamation Mark Irritant GHS07 |
| GHS Hazard Statements |
H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation H335:Specific target organ toxicity, single exposure;Respiratory tract irritation |
| Precautionary Statement Codes |
P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P264:Wash hands thoroughly after handling. P264:Wash skin thouroughly after handling. P271:Use only outdoors or in a well-ventilated area. P280:Wear protective gloves/protective clothing/eye protection/face protection. P302+P352:IF ON SKIN: wash with plenty of soap and water. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. |
Computed Descriptors for Calconcarboxylic acid
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