PHENOL RED SODIUM SALT Grade:ACS GRADE CAS Number: 34487-61-1Synonym(s): Phenolsulfonphthalein Molecular Weight: 376.36Molecular Formula: C19H13NaO5S Storage Condition: ROOM TEMPERATURE CodeSizePriceQuantity 0648-25G 0648-50G A pH indicator (Yellow to Red; range 6.8 – 8.4).