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Phenolphthalein (C20H14O4) is a synthetic organic compound that has carved a significant niche in the chemical world primarily as an acid-base indicator. Its characteristic transformation – colorless in acidic solutions and turning pink in alkaline conditions – makes it a vital tool for chemists performing precise quantitative analyses, such as acid-base titrations. Understanding the chemical principles behind this color change is fundamental for any professional working with this compound.
The color change of Phenolphthalein is a result of structural rearrangements in response to pH. In solutions with a pH below 8.3, Phenolphthalein exists in a colorless lactone form. As the pH rises above 8.3, the molecule undergoes a deprotonation and ring-opening process, forming a quinoid structure that absorbs visible light, hence the pink color. At very high pH levels (above 10), it can transition to another colorless form, which is important to note for highly alkaline solutions.
While its primary use is in titrations, Phenolphthalein also finds application in other areas. It’s employed in testing the carbonation depth of concrete, providing a visual indicator of concrete’s alkalinity. In educational laboratories, it's a common reagent for demonstrating chemical reactions and pH principles. It's important to note that while Phenolphthalein has historically been used as a laxative, this use has been largely discontinued due to safety concerns, including potential carcinogenicity. Therefore, when purchasing and handling Phenolphthalein, adherence to safety protocols is paramount.
For those in need of this versatile chemical, sourcing from a reputable manufacturer ensures quality and reliability. As a trusted supplier, we provide high-purity Phenolphthalein suitable for a wide range of laboratory and industrial applications. We encourage all users to consult the Safety Data Sheet (SDS) for proper handling, storage, and disposal procedures. If you are looking to buy Phenolphthalein or require a quote for bulk quantities, our team is ready to assist you in securing this essential chemical.
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1. 20 years of R&D, manufacturing and sales experience, serving customers in 60 countries and regions around the world;
2. Own R&D laboratory, pilot platform and large-scale production workshop, which can meet the audit requirements of global customers;
3. We can satisfy customers' perfect transition from small scale lab requirements (gram level) to commercialization requirements (hundred tons level).
A: We don't have Minimum Order Quantity, exact quantity should be provided before quotation for us to calculate the exact cost.
A: We don't provide free samples due to lots of request and expensive international courier's cost, we can deduct the sample charge after commercial order placed.
A: Our payment terms: Small or sample order: T/T IN ADVANCE. Commercial order: First order should be by T/T IN ADVANCE or L/C at sight, and following orders T/T 30~90days is acceptable subject to approval of credit application.
