Alizarin Red Powder – 25 gram packs

Alizarin Red S is an organic sulfonated anthraquinone dye widely used as a laboratory indicator and staining reagent. Its sodium salt contains hydroxyl, carbonyl, and sulfonate functional groups that contribute to its characteristic colour behaviour and interactions with metal ions. Alizarin Red S is used in analytical chemistry, mineral identification, and selected research staining procedures. Its colour response can vary with pH and chemical environment, making it useful for demonstrating indicator behaviour and studying chemical interactions. The reagent is relevant to educational chemistry practicals, university investigations, and laboratory procedures that require a colour-forming compound. The exact suitability of Alizarin Red for a particular analytical method depends on its chemical identity, grade, and method requirements.

Product Specifications

Specification	Details
Appearance	Yellow to orange-brown powder
Assay	99%
Chemical Name	Sodium alizarinsulfonate (Alizarin Red S)
Alternate Names	Sodium alizarin sulfonate, Mordant Red 3, Alizarin Carmine
Molecular Formula	C14H7NaO7S
Empirical Formula	C14H7NaO7S
CAS Number	130-22-3
Molecular Weight	342.26 g/mol
Grade	LR Laboratory Reagent

Key Features of Alizarin Red S

• Organic anthraquinone-based dye with a sulfonate functional group.
• Exhibits pH-dependent colour behaviour under suitable test conditions.
• Used as a staining and colour-forming reagent in selected laboratory methods.
• Supports demonstrations of indicator behaviour and chemical interactions.
• Suitable for compatible analytical and research procedures when the specified grade meets method requirements.

Laboratory Applications of Alizarin Red S

• Demonstration of colour changes associated with pH variation in supervised chemistry practicals.
• Staining and identification of carbonate minerals in geological laboratory work.
• Selected colorimetric and spectrophotometric investigations using validated methods.
• Research procedures involving calcium-associated staining, where the specified reagent form is appropriate.
• Teaching experiments on dyes, functional groups, and interactions between organic reagents and metal ions.

Why Choose Lab Wale to Buy Alizarin Red S

Lab Wale provides a sourcing option for laboratory chemicals and scientific supplies used by schools, colleges, universities, research centres, and analytical laboratories. When purchasing Alizarin Red, check the product identity, grade, pack size, and suitability for the intended method. Reviewing the available technical and safety information helps laboratories select an appropriate reagent for their requirements. The 25 g pack is a convenient listed pack size for laboratories that need a defined quantity for planned practical work and research.

Frequently Asked Questions About Alizarin Red S

What is Alizarin Red S used for in laboratories?

Alizarin Red S is used as a staining reagent, a colour-forming compound in selected analytical procedures, and a reagent for distinguishing certain carbonate minerals. Its use depends on the method, chemical form, and required grade.

What is the molecular formula of Alizarin Red S?

The molecular formula of Alizarin Red S sodium salt is C14H7NaO7S, and its molecular weight is approximately 342.26 g/mol. This formula is different from that of Alizarin, the unsulfonated compound.

What is the CAS number of Alizarin Red S?

The CAS Registry Number for Alizarin Red S sodium salt is 130-22-3. Check that the product label identifies the sodium sulfonate form, because the name Alizarin Red can also be used informally for related compounds.

Can Alizarin Red S be used in educational laboratories?

It can be used in suitable supervised chemistry practicals and demonstrations involving staining or colour responses. Instructors should assess the experiment, review the current Safety Data Sheet, and ensure that the reagent grade and method are appropriate.

How should Alizarin Red S be stored and handled?

Keep the reagent tightly closed in a compatible, labelled container in a cool, dry place, protected from contamination and excessive moisture. Avoid creating dust and use suitable gloves and eye protection. Follow the product’s Safety Data Sheet and institutional waste-disposal procedures.

Storage Conditions for Alizarin Red S

Store in a tightly closed, clearly labelled container in a cool, dry, well-ventilated location. Protect the powder from moisture, contamination, and excessive heat. Keep it separated from incompatible substances and follow the storage recommendations provided in the current Safety Data Sheet for the supplied product.

Precautions for Handling Alizarin Red S

Review the Safety Data Sheet before use. Wear appropriate laboratory gloves, protective clothing, and safety glasses, and avoid inhaling powder or allowing it to contact the eyes or skin. Handle the reagent carefully to limit dust formation. Clean spills using the institution’s approved procedures and dispose of solutions and residues according to local laboratory waste requirements.

Pack size: 25 g.