What is phenolphthalein NaOH and what is the chemical formula?

Phenolphthalein: This product is 3,3-bis(4-hydroxyphenyl)-1(3H)-isobenzofuranone (3,3-bis(4-hydroxyphenyl)-1(3H)-isobenzofuranone), white or yellowish crystals or powders, odorless, tasteless. Molecular Formula:

C20H14O4, CAS number: 77-09-8

It is an acid-base indicator phenolphthalein.

Phenolphthalein is a weak organic acid that has a colorless lactone structure in a solution of pH, as a quinone structure. The range of discoloration of phenolphthalein is so phenolphthalein can only detect alkalis and not acids. (light red) (red) Special indicator for alkaline substances Phenolphthalein is a weak organic acid, which has a colorless lactone structure in the solution of pH", and a red quinone structure when the pH is >.

The quinone or quinone type of phenolphthalein, which is very unstable in alkaline media, will slowly convert to the colorless carboxylate form; When encountering a more concentrated lye, it will immediately transform into a colorless carboxylate formula. Therefore, when the phenolphthalein reagent is dropped into a concentrated lye, the phenolphthalein begins to turn red, and soon the red color fades and becomes colorless.

Phenolphthalein is used to test whether it is minus If the solution is red, it means that it is minus.

Phenolphthalein and sodium hydroxide reaction equation: Hin + Naoh = Nain + H O, the chemical equation is also known as the chemical reaction equation, which is a formula that uses a chemical formula to represent a chemical reaction, and the chemical equation reflects the objective facts, and the formula that uses a chemical formula to represent the chemical reaction of a substance is called a chemical equation.

The chemical equation not only indicates the reactants, products, and reaction conditions. At the same time, the stoichiometric number represents the quantitative relationship between the reactants and the product substances, and the mass relationship between the substances can also be expressed through the relative molecular mass or relative atomic mass, that is, the mass ratio between the substances. For gas reactants and products, the volume ratio can also be obtained directly from the stoichiometric number.

Abbreviated as Hin+Naoh=Nain+HO.

Phenolphthalein (abbreviated as Hin) is a weak acid with the structural formula:

Phenolphthalein refers to a chemical finished product, which is in the form of crystal powder, which is insoluble in water. Its properties are colorless in acidic and neutral solutions and purplish-red in alkaline solutions. It is often used by people to detect acids and bases.

There is no requirement for this at the junior high school level.

Phenolphthalein (abbreviated as Hin) is a weak acid with the structural formula:

It can be abbreviated as Hin+Naoh=Nain+H2O

Phenolphthalein is an organic substance with a very complex molecular formula. When sodium hydroxide is added to phenolphthalein, a chemical reaction must have occurred, including the neutralization of acidic hydrogen and the tautomeric process, which is inconvenient to express, so it is usually not written. However, there is no doubt that this process is a chemical change, there is an equation.

It's just a physical change

Or add a mixture of sodium hydroxide and phenolphthalein.

I really didn't have this one, and I didn't study it in high school. It is only known that phenolphthalein turns red when exposed to alkali.