SINAINT® Phenolphthalein is a weak organic acid. It is white or slightly yellow fine crystals at room temperature. It is odorless and tasteless. It is hardly soluble in water but easily soluble in alcohol (ethanol) and ether. Dissolved in alcohol solution to make acid-base indicator, it is colorless in acid solution, red in lye or alkali metal carbonate solution, but if it is in concentrated alkali solution, it will generate colorless trimetal The salt, the red faded. In view of this characteristic, it is often used as an indicator of acid-base titration in laboratories. The color range of PH value is 8.2～10.0, from colorless to red. When the phenolphthalein reagent is dripped into water or a neutral, acidic aqueous solution, white turbidity will appear. This is because alcohol is easily soluble in water, and phenolphthalein, which is hardly soluble in water, precipitates out in the reagent.
