Description

Methyl Orange Indicator (C.I. 13025) by Merck Germany is a highly effective pH indicator widely used in analytical laboratories for acid-base titrations. With the chemical formula C₁₄H₁₄N₃NaO₃S and a molecular weight of 327.34 g/mol, it is commonly known by several synonyms such as 4-Dimethylaminoazobenzene-4′-sulfonic acid sodium salt, Gold Orange, Helianthine, and Orange II.

Features of Methyl Orange Indicator (25g, Merck):

• Sharp Color Change Range:

  • Red at pH < 3.4 (acidic conditions)

  • Orange at pH 3.4–4.4 (transition)

  • Yellow at pH > 4.4 (alkaline conditions)

• Typically used in titrations involving strong acids and weak bases

• Supplied as a powder, soluble in water or alcohol to create an indicator solution

Common Applications of Methyl Orange Indicator:

1. Acid-Base Titrations

Ideal for titrating strong acids (e.g., HCl) with weak bases (e.g., sodium carbonate). Its distinct color transition makes it perfect for identifying the equivalence point accurately.

2. Water Quality Testing

Used for testing pH levels in industrial wastewater and effluents, especially in acidic ranges.

3. Soil Analysis

Helps determine soil acidity, useful in agricultural and environmental studies.

4. Food and Beverage Industry

Utilized in pH testing of canned foods, beverages, and dairy products to monitor acidity levels.

5. Chemical Quality Control

Used in quality checks of chemicals to ensure proper acidity before use in formulations or synthesis.

6. Qualitative Analysis

Supports the detection of acidic components in inorganic qualitative analysis.

7. Educational & Acid-Base Equilibrium Studies

Favored in academic labs for its clear and sharp transition in color, enhancing student understanding of acid-base concepts.

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