Thymolphthalein
Synonym(s):5′,5′′-Diisopropyl-2′,2′′-dimethylphenolphthalein;Thymolphthalein
- CAS NO.：125-20-2
- Empirical Formula: C28H30O4
- Molecular Weight: 430.54
- MDL number: MFCD00005909
- EINECS: 204-729-7
- SAFETY DATA SHEET (SDS)
- Update Date: 2024-12-18 14:08:57
What is Thymolphthalein?
Description
An alkaline solution of thymolphthalein in alcohol makes a very good disappearing ink. The solution starts out blue, but when it absorbs carbon dioxide from the air, carbonic acid is formed, neutralizing the alkaline solution and causing the blue color to vanish. The color returns when the ink spot is treated with an alkaline solution.
Chemical properties
white fine crystalline powder
The Uses of Thymolphthalein
Thymolphthalein is a pH sensitive dye that has multiple uses such as testing hydration and/or saliva testing.
The Uses of Thymolphthalein
As pH indicator: colorless 9.3 to blue 10.5. Also as reagent for blood after decolorizing the alkaline solution by boiling with zinc dust.
Definition
ChEBI: Thymophthalein is a terpene lactone.
General Description
Thymolphthalien is an acid-base indicator which is colourless in acidic form and deep blue in basic form. Acidic form retains hydrogen on each hydroxyl group. It is suitable in preparing disappearing ink.
Synthesis
Thymolphthalein can be synthesized from thymol and phthalic anhydride.
Properties of Thymolphthalein
| Melting point: | 251-253 °C(lit.) |
| Boiling point: | 504.79°C (rough estimate) |
| Density | 0.92 g/mL at 25 °C |
| vapor pressure | 0.002Pa at 90℃ |
| refractive index | 1.6400 (estimate) |
| Flash point: | 74 °F |
| storage temp. | no restrictions. |
| solubility | ethanol: clarity passes test |
| form | Low Melting Mass |
| pka | 9.70, 10.0(at 25℃) |
| color | White to slightly yellow |
| Specific Gravity | 0.92 |
| PH | 8.6～10.5 |
| PH Range | 9.3(colourless)-10.5(blue) |
| Odor | Mild characteristic odor |
| explosive limit | 3.30-19% |
| Water Solubility | insoluble |
| λmax | 592nm, 396nm, 598nm |
| Merck | 14,9401 |
| BRN | 359413 |
| Major Application | Display device, semiconductors, recording materials, photoconductors, sol-gel matrix, tin electroplating process, counterfeit-proof paper, authentication system forsecure documents, inks, pencil leads, correction fluid, paints, petroleum marker, tennis ball, adhesives, floor coatings, textiles, detergents, insecticide, lotion, cleaning pads, food storage, determine bacterial growth, Streptococci in saliva, dental impressionmaterials |
| CAS DataBase Reference | 125-20-2(CAS DataBase Reference) |
| EPA Substance Registry System | Thymolphthalein (125-20-2) |
Safety information for Thymolphthalein
| Signal word | Danger |
| Pictogram(s) |
 Flame Flammables GHS02  Health Hazard GHS08 |
| GHS Hazard Statements |
H225:Flammable liquids H313:Acute toxicity,dermal H333:Acute toxicity,inhalation H371:Specific target organ toxicity, single exposure |
| Precautionary Statement Codes |
P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P260:Do not breathe dust/fume/gas/mist/vapours/spray. P303+P361+P353:IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower. P405:Store locked up. |
Computed Descriptors for Thymolphthalein
| InChIKey | GRBHJPCWQRVGND-UHFFFAOYSA-N |
Thymolphthalein manufacturer
Esjay Chemicals
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product: 125-20-2 Thymolphthalein ACS 95%
DeFINE CHEMICALS
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product: Thymolphthalein 125-20-2 98%
ARRAKIS INDUSTRIES LLP
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Phone:+91-7499586750
Whatsapp: +91- 7499586750
product: THYMOLPHTHALEIN PH INDICATOR SOLUTION 125-20-2 99%
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