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Congo Red


CAS Number: 573-58-0
Formula Weight: 696.68
Formula: C32H22N6Na2O6S2
Hazard Info: Toxic
Solubility: Water and Alcohol
Synonyms: Direct Red 28, C.I. No. 22120, Congo Red Stain, Congo Red Biostain
Shelf Life (months): 36
Storage: Green

Note: The chemical specifications for some items on this product page may differ from the specifications listed above. For more information, consult the Safety Data Sheet or contact your Ward's representative.

Caution: Please Note: This product is designed for educational and teaching laboratories, and no certificate of analysis is available.


   
 

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Item # Description Grade Size Chemical/Physical Specifications Unit Availability Price Quantity
470300-790 Congo Red
Laboratory 10 g Powder Each (10g) Retrieving Restricted
470300-784 Congo Red, Solution
Laboratory 100 mL 0.1% aqueous Each (100ml) Retrieving Restricted
470300-786 Congo Red, Solution
Laboratory 100 mL 0.5% aqueous Each (100ml) Retrieving Restricted
470300-788 Congo Red, Solution
Laboratory 100 mL 1% aqueous Each (100ml) Retrieving Restricted
restricted This product is marked as restricted and can only be purchased by approved Shipping Accounts. To apply for a shipping account number, click here. If you need further assistance, call Customer Service at 800-962-2660 or email wardscs@vwr.com.

Disposal

This disposal method is published for your convenience. You MUST have checked with your federal, state, and local regulations before using this method and these methods are only applicable for small laboratory sized quantities.

The disposal of this chemical does not need pretreatment and it is not necessary for any chemical reaction to be conducted before it is disposed into a landfill or down the school drain. HOWEVER, there are numerous conditions that should be met which are outlined below before this can be discharged.

If the material is in the solid form, it can be buried in a landfill if:
 a. Local regulations have been confirmed that this material can be disposed of in a landfill.
 b. Chemical is packed into a cardboard box with an appropriate amount of packing material.
 c. Cardboard box is sealed with durable tape.

If the material is in an aqueous form, it can be poured down the drain with excess water if:
 a. Local and State regulations have been checked and you have verified that this material is suitable for this type of disposal
 b. The school drain is connected to the sanitary sewer system.
 c. The quantity that you are disposing of is minimal. A good rule of thumb is less than 250 mL.
 d. Combinations of chemicals are not going down the drain at the same time.
 e. A twenty-fold excess of water is used when washing the chemical down the drain.

A good resource to contact is the local wastewater treatment facility as they can give you guidance and be a resource on drain disposal.

Solution Prep

Use a 0.1% aqueous solution as a pH indicator. Add 0.1 g of congo red to 75 ml of DI water. Dilute to a final volume of 100 ml with DI water. Use a 1% aqueous solution as a plant tissue stain. Add 1 g of congo red to 100 ml of DI water. Add four drops of ammonium hydroxide solution.

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