Methyl Orange 25gm

Cas No. 547-58-0

Molecular Weight: 327.33

Description: 

Methyl orange is a synthetic dye commonly used as a pH indicator in titrations, particularly in acid-base reactions. It is an azo dye, which means it contains a nitrogen-nitrogen double bond (–N=N–) linking aromatic rings.

Here are some key characteristics of methyl orange:

1. Chemical Structure:  It’s a sodium salt of the azo compound.
2. Color Change: Methyl orange changes color depending on the pH of the solution:
   • In acidic solutions (pH < 3.4), it appears red.
   • In alkaline solutions (pH > 4.4), it turns yellow.

   The color change occurs over the pH range of approximately 3.4 to 4.4, making it suitable for detecting weak acid/strong base and strong acid/weak base titrations.

3. Uses:
   • It is used in titrations to determine the endpoint of acid-base reactions.
   • Also used as a dye in the textile industry and in various scientific applications.
4. Safety: While methyl orange is not highly toxic, it can cause skin or eye irritation, and care should be taken when handling it.

Specification: 

Color:  Orange

Form: Crystalline powder

Loss on dryingmax. 5%

Absorbance (A) of 1% solution (pH 4.4) in a

1cm cell 

@470nm750 – 850

pH range3.1 (Pink orange) to 4.4 (Yellow)