Methyl Orange Indicator – ACS Grade

Product Overview

Methyl Orange Indicator is a laboratory pH indicator widely used in analytical chemistry, acid-base titration, and educational laboratory experiments. It is a synthetic azo dye that changes colour according to the acidity or alkalinity of a solution within a specific pH range. This colour-changing property makes Methyl Orange useful for identifying titration endpoints and demonstrating pH-related chemical reactions.

The referenced product is specified as ACS grade and has the Colour Index Number C.I. 13025. It is supplied as a yellowish-orange powder and is suitable for approved laboratory applications where an indicator with a defined transition range is required.

Product Description

Methyl Orange Indicator has the CAS Number 547-58-0 and the molecular formula C₁₄H₁₄N₃NaO₃S. Its molecular weight is 327.33 g/mol. These identification details help laboratories verify the chemical and maintain accurate purchasing, storage, and inventory records.

One of the main characteristics of Methyl Orange is its visual colour transition between approximately pH 3.2 and pH 4.4. In more acidic conditions, the indicator appears pink or red, while its colour changes towards yellow-orange as the pH increases through the transition range.

This behaviour makes it particularly useful in acid-base titrations where the expected endpoint falls within its transition interval. However, the suitability of the indicator depends on the chemistry of the sample and the titration method. It is not appropriate for every acid-base titration, so users should select an indicator based on the expected endpoint.

Key Features of Methyl Orange Indicator

• Product Name: Methyl Orange Indicator
• Grade: ACS
• CAS Number: 547-58-0
• Colour Index Number: C.I. 13025
• Molecular Formula: C₁₄H₁₄N₃NaO₃S
• Molecular Weight: 327.33 g/mol
• Physical State: Solid
• Appearance: Yellowish-orange powder
• Odour: Odourless
• Visual Transition Range: pH 3.2–4.4
• Acidic Colour: Pink or red
• Higher-pH Transition Colour: Yellow-orange
• Solubility: Soluble in approximately 500 parts water, according to the referenced specification
• Shelf Life: 60 months, subject to the manufacturer’s stated storage conditions

The referenced specification also states that a 0.1% aqueous solution should be clear under the specified ACS solubility test. Batch-specific documentation should be checked before use.

Applications of Methyl Orange Indicator

1. Acid-Base Titration

Methyl Orange is commonly used as an indicator in suitable acid-base titrations. Its distinct colour transition helps analysts identify the endpoint when the reaction conditions are appropriate for its pH range.

2. Analytical Chemistry

In analytical laboratories, Methyl Orange can support chemical analysis procedures that require a visual indicator. The method must specify that the indicator is suitable for the sample and expected endpoint.

3. Educational Laboratories

Schools, colleges, universities, and training laboratories may use Methyl Orange for supervised demonstrations of acid-base behaviour, indicator colour changes, and basic analytical chemistry principles.

4. Chemical Research

Research laboratories may use Methyl Orange in approved experimental procedures involving pH indicators and analytical measurements. Its use should follow the relevant method, laboratory risk assessment, and safety documentation.

Storage and Safety Precautions

Methyl Orange Indicator is classified as toxic if swallowed in the referenced safety documentation. It should only be handled by trained personnel or under appropriate laboratory supervision. Avoid swallowing the powder, generating dust, or allowing the substance to contact the eyes or skin.

Wear suitable laboratory gloves, protective clothing, and eye protection. Follow the current Safety Data Sheet (SDS) for handling, storage, first aid, spill response, and disposal requirements. Keep the container properly closed, clearly labelled, and stored in a designated chemical storage area.

Do not dispose of the chemical or its solutions into drains unless explicitly permitted by applicable regulations and institutional procedures.

Purchase Methyl Orange Indicator in Bangladesh

M/S Bright Scientific Co. supplies scientific and laboratory products for educational institutions, research laboratories, and industrial applications in Bangladesh. Contact the supplier to confirm the available pack size, current price, stock availability, and relevant product documentation before ordering.

Frequently Asked Questions (FAQs)

1. What is Methyl Orange Indicator?

Methyl Orange is a pH indicator used in suitable acid-base titrations and laboratory experiments to show changes in acidity through a visible colour transition.

2. What is the CAS Number of Methyl Orange?

The CAS Number is 547-58-0.

3. What is the molecular formula?

Its molecular formula is C₁₄H₁₄N₃NaO₃S.

4. What is the molecular weight?

The specified molecular weight is 327.33 g/mol.

5. What is the pH transition range?

Methyl Orange changes from pink or red at approximately pH 3.2 to yellow-orange at approximately pH 4.4.

6. What is Methyl Orange used for?

It is used in suitable acid-base titrations, analytical chemistry, supervised educational experiments, and approved laboratory research procedures.

7. Is Methyl Orange safe to handle?

It requires appropriate precautions and is classified as toxic if swallowed. Follow the current SDS and use suitable protective equipment.

8. Where can I buy Methyl Orange Indicator in Bangladesh?

Contact M/S Bright Scientific Co. for current pricing, available pack sizes, and stock information.

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