Phenolphthalein Powder Extra Pure

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SHORT DESCRIPTION

Phenolphthalein Powder Extra Pure is a high-purity pH indicator extensively used in analytical chemistry and laboratory applications. This fine, white to pale pink crystalline powder is colorless in acidic solutions but turns a vivid pink to deep magenta in basic environments, typically transitioning around a pH of 8.2 to 10.0. Its sharp and distinct color change makes it ideal for acid-base titrations, particularly in educational, industrial, and research settings.

In addition to its primary role in titrations, Phenolphthalein is also used in various chemical formulations, soil pH testing, and sometimes as a dye component in forensic applications. Although previously used as a laxative, it is now restricted to laboratory use due to health concerns. It should be handled with care—using gloves, protective eyewear, and in well-ventilated areas—to avoid inhalation or prolonged contact. Store in a cool, dry place, away from strong oxidizers and light.

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Category: LABORATORY CHEMICALS Tags: AcidBaseIndicator, AnalyticalReagent, ExtraPure, LaboratoryChemicals, Phenolphthalein, PHIndicator, SpecialtyChemicals, Titration

Description

USES

PRIMARY USES

Acts as a pH indicator in acid-base titrations, changing from colorless (acidic) to pink (alkaline) around pH 8.2–10.0.
Commonly used in analytical chemistry for titration of weak acids with strong bases.
Utilized in laboratory experiments for teaching acid-base concepts in educational settings.
Key ingredient in formulating chemical test kits and indicator solutions.
Sometimes included in water quality testing to assess alkalinity levels.

SECONDARY USES

Historically used as a laxative component (now largely discontinued due to safety concerns).
Employed in forensic science in presumptive blood tests like the Kastle-Meyer test.
Occasionally used as a colorant in pH-sensitive applications.
Studied in chemical kinetics and reaction mechanisms as a visual reaction marker.
Can be used in environmental monitoring to measure pH in soil and aquatic systems.

KEY PRODUCT FEATURES

KEY ATTRIBUTES

1. Basic Identification Attributes

Chemical Name: Phenolphthalein
CAS Number: 77-09-8
HS Code: 2932.29.90
Molecular Formula: C₂₀H₁₄O₄
Synonyms:
- 3,3-Bis(4-hydroxyphenyl)-1(3H)-isobenzofuranone
- C.I. 764
- Phph
- Indicator B

2. Physical & Chemical Properties

Physical State: Solid (fine crystalline powder)
Color & Odor: White to pale yellow; odorless
Boiling Point: Decomposes before boiling
Melting Point: ~258–262 °C
Density: ~1.3 g/cm³
Solubility:
- Insoluble in water
- Soluble in alcohol and alkaline solutions
pH Level (Indicator Range):
- Colorless below pH 8.2
- Pink to fuchsia above pH 10.0
Vapor Pressure: Negligible
Flash Point: Not applicable
Autoignition Temperature: Not readily available
Viscosity: Not applicable

3. Safety & Hazard Attributes

Hazard Class (GHS Classification):
- Health Hazard (Carcinogenic - suspected)
- Irritant (may cause eye, skin, and respiratory tract irritation)
NFPA Ratings:
- Health: 2
- Flammability: 1
- Reactivity: 0
Exposure Limits:
- OSHA PEL: Not established
- ACGIH TLV: Not established
Reactivity:
- Stable under recommended conditions
- Avoid strong oxidizing agents

4. Storage & Handling Attributes

Storage Conditions:
- Store in tightly sealed containers in a cool, dry, and well-ventilated area
- Protect from moisture and light
Incompatible Materials:
- Strong acids and oxidizers
Container Type: Plastic or glass containers with tight seals
Shelf Life & Expiration Date: Up to 3 years if stored properly
Special Handling Requirements:
- Use gloves, safety goggles, and a dust mask or fume hood when handling powder

5. Regulatory & Compliance Attributes

Regulatory Status:
- Listed in TSCA, REACH
- May be subject to reporting under SARA Title III
Transportation Restrictions:
- Not classified as a hazardous material for transport (non-DOT regulated)
Waste Disposal Method:
- Dispose via licensed chemical waste handler according to local regulations

6. Environmental & Health Impact

Ecotoxicity:
- Toxic to aquatic organisms in large quantities
Persistence in Environment:
- Moderately persistent under natural conditions
Carcinogenicity/Mutagenicity:
- IARC: Group 2B (possibly carcinogenic to humans)
- OSHA: Recognized as a potential occupational hazard
Biodegradability:
- Limited; may degrade slowly in soil or water

SAFETY HANDLING PRECAUTIONS

SAFETY PRECAUTIONS

Personal Protective Equipment (PPE):

Wear a lab coat, nitrile gloves, and chemical splash goggles.
Use a dust mask or work in a fume hood to avoid inhalation of fine particles.

Handling:

Avoid contact with eyes, skin, and clothing.
Prevent dust generation and inhalation.
Wash hands thoroughly after handling.
Use only with adequate ventilation.

Storage:

Store in a cool, dry, and well-ventilated area.
Keep the container tightly closed.
Protect from moisture and light.
Store away from strong oxidizing agents and acids.

FIRST AID MEASURES

Inhalation:

Move to fresh air immediately.
Seek medical attention if respiratory symptoms develop.

Skin Contact:

Wash thoroughly with soap and water.
Remove contaminated clothing.
Seek medical advice if irritation or redness occurs.

Eye Contact:

Rinse cautiously with water for several minutes.
Remove contact lenses if present and easy to do.
Continue rinsing and seek medical attention.

Ingestion:

Rinse your mouth thoroughly with water.
Do not induce vomiting.
Seek immediate medical attention.

FIRE FIGHTING MEASURES

Flammability:

May be combustible in powder form. Fine dust can pose explosion hazard in air.

Extinguishing Media:

Use dry chemical, carbon dioxide, or alcohol-resistant foam.
Water spray may be used to cool containers but can spread dust.

Hazardous Combustion Products:

May produce carbon oxides and toxic fumes upon decomposition.

Firefighter Protection:

Wear self-contained breathing apparatus (SCBA) and full protective clothing.
Avoid inhalation of combustion products.