Molekula
Phenol Red, sodium salt water soluble
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Phenol Red, sodium salt water soluble is a pH indicator dye used primarily in biological buffers, cell culture media, and biochemical assays to visually monitor pH changes around neutral ranges (6.8–8.4). It transitions from yellow to red as the pH increases, making it ideal for applications requiring precise pH tracking. CAS 34487-61-1, molecular formula C19H13NaO5S (MW 376.36), stored at ambient conditions. Signal word: Warning. Molekula supplies Phenol Red, sodium salt water soluble from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
-
25 g — £30.90 per pack ex VAT · £37.08 inc. VAT
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | Dark Reddish Brown Powder |
| Grade | ACS |
| Loss on Drying | ≤ 5.0% (110°C) |
| ABSORPTIVITY (E1% 1 CM CELL PH 6.5) | (Min.) 500.0 |
| Wavelength of Max. Absorption | 422.0-435.0nm |
| Ph (Transition Range) | pH6.8 (Yellow) - Pass pH8.2 (Red) |
| Solubility (0.1% water) | Clear Red Solution |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Neutral |
Identification
| Property | Value |
|---|---|
| SKU | 45234408 |
| CAS Number | 34487-61-1 |
| IUPAC Name | sodium 2-[(4-hydroxyphenyl)-(4-oxocyclohexa-2,5-dien-1-ylidene)methyl]benzenesulfonate |
| Molecular Formula | C19H13NaO5S |
| Molecular Weight | 376.36 |
| Exact Mass | 376.0381 |
| SMILES | C1=CC=C(C(=C1)C(=C2C=CC(=O)C=C2)C3=CC=C(C=C3)O)S(=O)(=O)[O-].[Na+] |
| InChIKey | RBFZWTMVVUVHLM-UHFFFAOYSA-M |
| InChI | InChI=1S/C19H14O5S.Na/c20-15-9-5-13(6-10-15)19(14-7-11-16(21)12-8-14)17-3-1-2-4-18(17)25(22,23)24;/h1-12,20H,(H,22,23,24);/q;+1/p-1 |
| PubChem CID | 4013450 |
| REACH Code | Y113 |
| TSCA Listed | Yes |
| HTS Code | 2934.99.9001 |
| Tariff Code | 2934999090 |
Safety & GHS
-
Health Hazard
GHS07
Hazard statements
- H315 Causes skin irritation
- H319 Causes serious eye irritation
- H335 May cause respiratory irritation
Precautionary statements
- P261 Avoid breathing dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P302+352 IF ON SKIN: Wash with soap and water
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- Phenol Red (sodium salt)
- phenol red sodium
- PHENOL, 4,4'-(1,1-DIOXIDO-3H-2,1-BENZOXATHIOL-3-YLIDENE)BIS-, SODIUM
- Phenol, 4,4'-(3H-2,1-benzoxathiol-3-ylidene)bis-, S,S-dioxide, monosodium salt
- Phenolsulfonephthalein sodium
- Phenolsulfonephthalein sodium salt
- PHENOLSULFONPHTHALEIN SODIUM SALT
- RBFZWTMVVUVHLM-UHFFFAOYSA-M
- Sodium Phenol Red
- sodium,4-[3-(4-hydroxyphenyl)-1,1-dioxo-2,1lambda6-benzoxathiol-3-yl]phenolate
Frequently asked questions
What is Phenol Red, sodium salt water soluble commonly used for?
Phenol Red, sodium salt is primarily used as a pH indicator in biological buffers, cell culture media, and biochemical assays, with a transition range of pH 6.8–8.2 (yellow to red).
What is the molecular formula and molecular weight of Phenol Red, sodium salt?
The molecular formula is **C₁₉H₁₃NaO₅S**, and the molecular weight is **376.36 g/mol**.
How should Phenol Red, sodium salt be stored?
Store at **ambient temperature** in a tightly sealed container, away from moisture and direct light.
What grades or purities of Phenol Red, sodium salt does Molekula supply?
Molekula supplies **analytical grade** Phenol Red, sodium salt, suitable for laboratory and research applications.
Can Molekula supply Phenol Red, sodium salt in bulk quantities?
Yes, Molekula can provide Phenol Red, sodium salt in bulk, with quantities and packaging tailored to your needs.
What documentation comes with an order of Phenol Red, sodium salt?
Each order includes a **Certificate of Analysis (CoA)**, Material Safety Data Sheet (MSDS), and batch-specific documentation for traceability.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.