Phenolphthalein 0.1% Solution in Ethanol

Phenolphthalein 0.1% Solution in Ethanol
Other Names: Phenolphthalein Indicator Solution, C.I. 75470 solution
CAS Number (Phenolphthalein): 77-09-8
CAS Number (Ethanol): 64-17-5
Sum Formula (Phenolphthalein): C₂₀H₁₄O₄
Appearance: Colorless to pale yellow liquid

Phenolphthalein 0.1% solution in ethanol is a widely used acid-base indicator that changes color from colorless (in acidic pH < 8.2) to pink (in basic pH > 10). It is prepared by dissolving phenolphthalein in ethanol to ensure good solubility and stability.

Chemical and Physical Properties
Concentration: 0.1% (w/v) phenolphthalein in ethanol
Boiling Point: ~78°C (ethanol base)
Solubility: Completely miscible with water and organic solvents
Color Transition: pH 8.2 (colorless) to pH 10.0 (pink/fuchsia)
Flash Point: ~12°C (closed cup, due to ethanol)
Stability: Stable under standard storage conditions

Applications
Used as an acid-base indicator in titration and analytical chemistry
Applied in laboratory experiments requiring clear endpoint detection
Suitable for industrial processes where pH monitoring with phenolphthalein is needed

Safety

Signal Word: Danger

Hazard Statements

H315 Causes skin irritation.

H341 Suspected of causing genetic defects.

H350 May cause cancer.

H361f Suspected of damaging fertility.

Precautionary Statements

P202 Do not handle until all safety precautions have been read and understood.

P264 Wash skin thoroughly after handling.

P280 Wear protective gloves/ protective clothing/ eye protection/ face protection.

P302 + P352 IF ON SKIN: Wash with plenty of water.

P308 + P313 IF exposed or concerned: Get medical advice/ attention.

P332 + P313 If skin irritation occurs: Get medical advice/ attention.

First Aid Measures
Eye Contact: Rinse with water for at least 15 minutes. Seek medical attention if irritation persists
Skin Contact: Wash with soap and water
Inhalation: Move to fresh air
Ingestion: Rinse mouth with water. Seek medical advice if unwell

Handling and Storage
Store tightly closed in a cool, dry, and well-ventilated place
Keep away from open flames and sources of ignition
Use only in areas with proper ventilation due to ethanol vapors