68-11-1
Product Name:
Mercaptoacetic acid
Formula:
C2H4O2S
Synonyms:
Mercaptoacetic acid;Mercaptoacetic acid, 2-Mercaptoethanoic acid;Thioglycolic acid
Inquiry
CHEMICAL AND PHYSICAL PROPERTIES
| Physical Description | Thioglycolic acid appears as a colorless liquid with an unpleasant odor. Density 1.325 g / cm3. Used to make permanent wave solutions and depilatories. Corrosive to metals and tissue. |
|---|---|
| Color/Form | Colorless liquid |
| Odor | Strong, unpleasant odor |
| Boiling Point | 248 °F at 20 mmHg (NTP, 1992) |
| Melting Point | 2.3 °F (NTP, 1992) |
| Flash Point | 235 °F (NTP, 1992) |
| Solubility | greater than or equal to 100 mg/mL at 64 °F (NTP, 1992) |
| Density | 1.3253 at 68 °F (NTP, 1992) - Denser than water; will sink |
| Vapor Density | 3.18 (Air = 1) |
| Vapor Pressure | 10 mmHg at 64 °F (NIOSH, 2023) |
| LogP | log Kow = 0.09 |
| Stability/Shelf Life | Stable under recommended storage conditions. |
| Autoignition Temperature | 350 °C |
| Decomposition | When heated to decomp it emits toxic fumes of /sulfur oxides/. |
| Viscosity | 6.55 mPa.s (= cP) at 20 °C |
| Corrosivity | Corrosive |
| Heat of Combustion | 1450 kJ/mol |
| Heat of Vaporization | 627.2 J/g |
| Refractive Index | Index of refraction: 1.5080 at 20 °C/D |
| Dissociation Constants | pKa = 3.55 |
| Other Experimental Properties | Freezes at -16 °C and distills under reduced pressure |
| Chemical Classes | Other Classes -> Sulfur Compounds |
SAFETY INFORMATION
| Signal word | Danger |
|---|---|
| Pictogram(s) |
 Corrosion Corrosives GHS05  Skull and Crossbones Acute Toxicity GHS06 |
| GHS Hazard Statements |
H314:Skin corrosion/irritation H317:Sensitisation, Skin |
| Precautionary Statement Codes |
P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P270:Do not eat, drink or smoke when using this product. P280:Wear protective gloves/protective clothing/eye protection/face protection. P303+P361+P353:IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower. 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
| Molecular Weight | 92.12 g/mol |
|---|---|
| XLogP3 | 0.1 |
| Hydrogen Bond Donor Count | 2 |
| Hydrogen Bond Acceptor Count | 3 |
| Rotatable Bond Count | 1 |
| Exact Mass | 91.99320054 g/mol |
| Monoisotopic Mass | 91.99320054 g/mol |
| Topological Polar Surface Area | 38.3 Ų |
| Heavy Atom Count | 5 |
| Formal Charge | 0 |
| Complexity | 42.9 |
| Isotope Atom Count | 0 |
| Defined Atom Stereocenter Count | 0 |
| Undefined Atom Stereocenter Count | 0 |
| Defined Bond Stereocenter Count | 0 |
| Undefined Bond Stereocenter Count | 0 |
| Covalently-Bonded Unit Count | 1 |
| Compound Is Canonicalized | Yes |
PRODUCT INTRODUCTION
description
Thioglycolic acid appears as a colorless liquid with an unpleasant odor. Density 1.325 g / cm3. Used to make permanent wave solutions and depilatories. Corrosive to metals and tissue.