How do you use a phenopthalene indicator?

Answer 1

phenols can be prepared by the following methods.

1) hydrolysis of cholorobenzene:

in this process, chlorobenzene which can be obtained by the cholorinationof benzene, is heated at 350*C under high pressure with aqueous sodium hydroxide to get sodium phenoxide, which on acidification yields phenol.

2) pyrolosis of sodium benzenesulphonate:

this, the first commercial process for industrial synthesizing phenol , was developed in Germany in 1890. sodium benzenesulphonate is melted with sodium hydrooxide at 350*C to produce sodium phenoxide, which on acidification yields phenol.

3) oxidaton of cumene:

benzene is alkylated with propene to produce cumene, which is oxidized with air to produce cumene hydroperoxide, which on treatment with 10% sulfuric acid undergoes a hydrolytic rearrangement to yield phenol and acetone.

Answer 2

1. FROM CHLOROBENZENE(DOWS PROCESS) chlorobenzene when heated with sodium hydroxide at 623K and 300atm pressure gives phenol.
2. FROM BENZENE SULPHONIC ACID benzene sulphonic acid when treated with NaOH gives phenol.
3. FROM BENZENE DIAZONIUM CHLORIDE benzene diazonium chloride when warmed with water gives phenol.
4. FROM CUMMENE(Manufacture of phenol) cummene when oxidised using air gives cummene hydro peroxide which on heating using dil acid gives phenole and acetone.

Answer 3

Phenolphthalein is used as an acid-base indicator. It changes color in acidic and basic solutions. In an acid, it remains colorless, while in a base, it turns pink or red. It is commonly used in titrations to indicate the endpoint when the solution becomes neutral.

Answer 4

a substance used in the concentration camps in world war one to kill men remaining alive in the bunkers.

Answer 5

sir
iam akhlesh i want a total information about making of domestic use phenol.

Answer 6

Disolve 0.1 gr of phenol red indicator in 100ml methanol

Answer 7

How do you prepare phenol?