Phenol red sodium salt dye pH-indicator, Sigma-Aldrich®

Supplier: SIGMA-ALDRICH MICROSCOPY
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Synonyms: Sodium hydrogen 4,4'-(3H-2,1-benzoxathiol-3-ylidene)bisphenolate S,S-dioxidePhenol red water soluble3,3-Bis(4-hydroxyphenyl)-3H-benzo[c][1,2]oxathiole 1,1-dioxide, sodium salt

M-Clarity™ quality level = MQ200

P4758-50GEA 223 GBP
P4758-50G P4758-5G P4758-25G
Phenol red sodium salt dye pH-indicator, Sigma-Aldrich®
Phenol red sodium salt

Phenol Red sodium salt is widely used as a pH indicator. At a pH of 6,4 and below, phenol red solution will have a yellow colour. At a pH of 8,2 and above, it will have a red colour. It is commonly used in culture media to detect neutral to acidic pH changes.


  • Phenol Red sodium salt has been used as an indicator during single-guide RNA microinjection into one-cell stage zebrafish embryos
  • Suitable for use as a pH indicator

Formula: C₁₉H₁₃NaO₅S
MW: 376.35 g/mol
Melting Pt: 285 °C (dec., lit.)
Storage Temperature: Room Temperature
MDL Number: MFCD00066901
CAS Number: 34487-61-1
EINECS: 252-057-8
Merck Index: 12,07397

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Specification Test Results

Appearance (Colour) Red to Brown
Appearance (Form) Powder
Infrared spectrum Conforms to Structure
Solubility (Colour) Dark Red
Solubility (Form), 1 mg/ml, H₂O Solution
pH Pass 6.8 (Yellow) to 8.2 (Red)
Recommended Retest Period 5 Years

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