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Congo Red pH indicator is a brownish-red powder or paper strip that undergoes a distinct color change from blue-violet (pH <3.0) to red-orange (pH >5.2), making it suitable for detecting acidic conditions in titrations and qualitative pH monitoring.
Identity and Composition
Chemical name: Congo Red (sodium salt of benzidinediazo-bis-1-naphthol-4-sulfonic acid); CI 22120.
Molecular formula: C₃₂H₂₂N₆Na₂O₆S₂; molecular weight 696.65 g/mol.
Form: Powder (soluble in water: 1 g/30 mL) or impregnated paper rolls.
Physical Properties
Appearance: Brownish-red odorless powder; pH of 1% solution 8.5–9.0.
Transition range: Blue-violet (pH 3.0) ⇌ red (pH 5.2).
Stability: Aggregates in high concentration/salinity/low pH; light-sensitive in solution.
Typical Uses
Acid-base indicator paper/ solution for qualitative pH testing (inverse of litmus).
Histology stain for amyloid (apple-green birefringence), plant/fungal cell walls, Gram-negative bacteria.
Textile/paper dye, biological stain.
Handling and Safety
Store sealed, protected from light/moisture. Potential carcinogen (azo dye); irritant—use PPE.
For catalog: “Congo Red pH indicator, brownish-red powder, pH 3.0 (blue-violet) to 5.2 (red), water-soluble, for acid detection/titrations; microscopy stain.”
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Ferrous borate extra pure is a high-quality iron(II) borate compound (commonly referred to as iron(II) borate or ferrous borate), used predominantly in laboratory and industrial settings for applications that demand high purity standards. It typically appears as a fine, air-sensitive solid and is valued for its chemical stability under controlled conditions. The compound features a high degree of purity, making it especially suitable for analytical work, advanced research, and select industrial processes.
Product Description for Website
Ferrous borate extra pure (Iron(II) borate) is a premium-grade inorganic salt prepared to strict purity standards, ensuring low levels of contaminants and accurate stoichiometry for scientific and technical applications. The product is carefully processed and packaged to maintain its chemical integrity and support reliable results in laboratory analysis and synthesis.
Synonyms: Iron(II) borate, Ferrous borate
Chemical Formula: Fe(BO2)2 (hydrated forms and other stoichiometries possible)
Appearance: Pale solid, may be air-sensitive
Grade: Extra pure (analytical/research grade)
Applications: Used in specialized laboratory analyses, catalyst systems, advanced inorganic synthesis, and as a starting material in certain industrial applications where high purity is critical.
Key Features
High purity and controlled chemical analysis for reliable, reproducible results
Packaged with minimal contamination risk and maximum shelf-life
Suitable for use in chemical research, formulation, and manufacturing at the analytical level
Safety & Handling
Ferrous borate is generally stable under typical laboratory conditions but should be handled with care as it may be sensitive to atmospheric moisture and air. Use standard personal protective equipment and store in a tightly sealed container in a cool, dry environment.
This concise description is suitable for use as a base product summary or catalog entry for e-commerce or laboratory supply websites, ensuring clarity for research and procurement professionals.
Ferrous borate extra pure is a high-quality iron(II) borate compound (commonly referred to as iron(II) borate or ferrous borate), used predominantly in laboratory and industrial settings for applications that demand high purity standards. It typically appears as a fine, air-sensitive solid and is valued for its chemical stability under controlled conditions. The compound features a high degree of purity, making it especially suitable for analytical work, advanced research, and select industrial processes.
Product Description for Website
Ferrous borate extra pure (Iron(II) borate) is a premium-grade inorganic salt prepared to strict purity standards, ensuring low levels of contaminants and accurate stoichiometry for scientific and technical applications. The product is carefully processed and packaged to maintain its chemical integrity and support reliable results in laboratory analysis and synthesis.
Synonyms: Iron(II) borate, Ferrous borate
Chemical Formula: Fe(BO2)2 (hydrated forms and other stoichiometries possible)
Appearance: Pale solid, may be air-sensitive
Grade: Extra pure (analytical/research grade)
Applications: Used in specialized laboratory analyses, catalyst systems, advanced inorganic synthesis, and as a starting material in certain industrial applications where high purity is critical.
Key Features
High purity and controlled chemical analysis for reliable, reproducible results
Packaged with minimal contamination risk and maximum shelf-life
Suitable for use in chemical research, formulation, and manufacturing at the analytical level
Safety & Handling
Ferrous borate is generally stable under typical laboratory conditions but should be handled with care as it may be sensitive to atmospheric moisture and air. Use standard personal protective equipment and store in a tightly sealed container in a cool, dry environment.
This concise description is suitable for use as a base product summary or catalog entry for e-commerce or laboratory supply websites, ensuring clarity for research and procurement professionals.