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.
a substance used in the concentration camps in world war one to kill men remaining alive in the bunkers.
sir
iam akhlesh i want a total information about making of domestic use phenol.
Disolve 0.1 gr of phenol red indicator in 100ml methanol
How do you prepare phenol?
An indicator is use to detect the given object is acid or a base
iodine...
You use Universal Indicator solution.
It is use in altitude measurement system for aeroplane safty purpose
Use of paper avoid the contamination of the sample.
Phenopthalene is used commonly
Phenopthalene turned into pink.pH should be above 10.
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Starch is not the indicator. Iodine is the indicator of starch.
cabbage juice is a natural pH indicator
Methyl red is an adequate indicator.
An indicator is use to detect the given object is acid or a base
With indicator papers the pH of a liquid is evaluated. Also many indicator papers are used for testing chemicals.
to indicate what the chemical is.
False
As a temp. indicator in thermometers.
yes .. we use methyl orange as an indicator ... when added it gives a straw yellow colour