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.
iodine...
You can use a blender or food processor to grind up red cabbage to make an indicator solution. Make sure to strain the mixture to separate the liquid from the solids. The liquid will then be ready to use as a pH indicator.
Use of paper avoid the contamination of the sample.
A pH indicator: the color is changed at the end of the reaction, when the solution become alkaline.
An indicator changes color at a specific pH range. To determine the endpoint of a neutralization reaction, an indicator that changes color near the neutral pH of 7 would be used. The reaction is stopped when the indicator changes color, indicating that the acid and base have been neutralized.
Phenolphthalein is commonly used as the indicator for the titration of a weak acid and a strong base. It changes color from colorless to pink at the equivalence point of the titration when the weak acid is completely neutralized by the strong base.
Phenopthalene turned into pink.pH should be above 10.
Methyl red is an adequate indicator.
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.
Indicator is a process which is used to find out the substanceis acid,base and salt. example: litmus paper and termuric both are natural indicator. example of artificial indicator: mithyl orange and phenolphtaceil
How do you use the "AV" indicator in the contact lens.
A good forex, or also known as FX indicator to use while in the market would be the FCCal indicator. From popular consumer reviews, it helps prevent trades during a news report.
Typically, 1-2 drops of phenolphthalein indicator are sufficient to use in an acid-base titration experiment. It is important not to use too much indicator, as it can affect the accuracy of the titration results.
use a dial indicator