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Natural rubber: Natural rubber is obtained by making small incisions on the bark of certain types of trees, like "Have a brasiliensis" and "Ganynle". White milky liquid substance (rubber latex) from the rubber tree by tapping is obtained. Latex is sieved to remove impurities then coagulated using coagulants like acetic acid or formic acid. Coagulated mass convert into coagulum. Coagulum is washed, dried and treated as follows:
1. Copper rubber: It is prepared by adding, little amount of sodium bisulphite, a retarder prevents, the discoloration and softening of rubber. Coagulum is allowed to drain for about two hours and after that it is passed through a creeping machine to form sheets of rubber of about 1 mm.
2. Smoked sheet: For preparing smoked sheets coagulation is carried out in long tanks. Sides of the tank have vertical grooves fitted with metal plates. First, dilute latex is added into the tanks and before that plates are removed. Coagulating agent, formic acid or acetic acid is then added and mixture is thoroughly stirred then plates are fitted and allowed to dry slabs are formed.
I have a question about HNMR OF RESONANCE system.
Complexometric Titrations - Types of titrations A titration, where an dissolved complex is formed at the equivalence point, is termed as complexometric titration. These types
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list down all the chemical properties of s- block?
Redox systems in bioinorganic chemistry
Explain Protonation Protonation of the ring double bond gives a tertiary carbocation that reacts with the carbonyl oxygen of the ester to give the lactone.
priming and foaming.
Reaction due to ethernal oxygen (a) The boiling point of peroxide is higher as compared to that of ether. It is not present as remains in the distillation of ether and may reas
complete assignment for half life determination
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