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Neminath Instruments

Phenolphthalein

A chemical indicator that turns colorless in acid and pink in base, commonly used in titrations to detect pH changes in solutions.

Phenolphthalein

Application

  • Acid–base titration indicator in chemical analysis
  • Determination of acidity/alkalinity in dairy, chemical, and pharma labs
  • Educational laboratory experiments and volumetric analysis
  • pH indication in analytical procedures

Compliance Standard

  • Conforms to AR / LR Grade specifications (as applicable)
  • As per ISO / ACS reagent quality standards
  • Packed and labeled as per GHS laboratory safety norms

Product Description

Phenolphthalein is a white to faint yellow crystalline powder used as a visual indicator in acid–base titrations. Commonly prepared as a 1% solution in ethanol for laboratory use. It remains colorless in acidic medium and turns pink in alkaline medium, making it ideal for endpoint detection in titration.

Technical Specifications

Parameter

Specification

Chemical Name

Phenolphthalein

Chemical Formula

C??H??O?

Molecular Weight

318.32 g/mol

Form

Crystalline powder / prepared solution

Grade

AR / LR Grade

Solubility

Soluble in alcohol, slightly soluble in water

Indicator Range (pH)

8.2 – 10.0

Color Change

Colorless (acidic) to Pink (alkaline)

Apparatus is Supplied

  • Phenolphthalein powder bottle or ready 1% indicator solution bottle
  • Proper labeling and safety instructions

Common Capacities Available

Powder:

  • 10 grams
  • 25 grams
  • 50 grams

Solution (1% in ethanol):

  • 100 ml
  • 250 ml
  • 500 ml

Optional Accessories

  • Dropper bottle for indicator use
  • SDS / MSDS copy
  • Measuring dropper

Dimensions & Weight (Approx.) (for 100 ml solution pack)

Parameter

Value

Bottle Height

~110 mm

Bottle Diameter

~45 mm

Gross Weight

~120 grams

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