Phenolphthalein 0.05% w/v

Phenolphthalein 0.05% w/v



From: £27.06

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Looking for Phenolphthalein 0.05% w/v?

We supply phenolphthalein 0.05% w/v in 2.5L containers, with discounts available on bulk orders over 4 items. Full MSDS is available to download from our website. We also offer many other options with all our products, from personalised labelling to bespoke chemicals.


Phenolphthalein As A pH Indicator: How Does it Work?

Phenolphthalein’s most popular use is as a pH indicator. It can be used by itself, or be an ingredient in universal indicators, alongside thymol blue or methyl red. These mixtures cover a wider range of pH changes.

From a chemical point of view, phenolphthalein works as a pH indicator due to 4 different states in solutions, with different colourations:

  • In strongly acidic conditions (pH<1): orange colour
  • In mildly acidic and near neutral conditions (0<pH<8.2): colourless
  • In alkaline conditions (8.2<pH<12): pink
  • In strongly alkaline conditions (pH>13): colourless


Niche Applications of Phenolphthalein

This compound has found its way into several colour-changing curious applications:

  • When Barbie changes hair colour: Phenolphthalein is commonly used in toys, such as Barbie dolls and others, which involve a colour change. In this case, phenolphthalein is typically mixed with sodium hydroxide, which then can react with carbon dioxide in the air. This reaction results in a pH drop and Barbie can change her hair colour!
  • Hard as concrete: This compound is also used to assess the quality of concrete. Under normal circumstances, concrete has a naturally high pH – around 8.5 – due to reaction with water. In this case, when a phenolphthalein solution is used, concrete turns bright pink. However, if this colour does not appear, it may be a sign of carbonation and deterioration.


100% Quality Guarantee

All our products come with 100% quality guarantee and are usually shipped within 24 hours after purchase. In addition to phenolphthalein, we also offer a wide range of other products, from pharmaceutical chemicals to specialist test kits. In addition, we also offer bespoke products to cover your needs. Simply contact us for further information.




MSDS Files

The following files are available to download:

Product IDProductpost_statusBulkDownload SDS File
4236Phenolphthalein 0.05% w/vpublish1319 - 1319 - SDS10106.pdf

Please note: we only deliver to registered UK businesses at non-residential addresses with a minimum order value of £100 before VAT

We only supply to mainland UK, contact us on 0800 990 3258 for rates to Ireland.

Please notify us if you have specific delivery requirements such as restricted access, requirement for a tail-lift delivery vehicle or pallet truck. Failure to notify us of a special delivery instructions can incur additional charges from our carriers.

0800 990 3258