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p-DCB is produced by chlorination of benzene using ferric chloride as a catalyst: . C 6 H 6 + 2 Cl 2 → C 6 H 4 Cl 2 + 2 HCl. The chief impurity is the 1,2 isomer.The compound can be purified by fractional crystallization, taking advantage of its relatively high melting point of 53.5 °C; the isomeric dichlorobenzenes and chlorobenzene melt well below room temperature.
There are three distinct chemical compounds which are dichlorobenzenes: . 1,2-Dichlorobenzene or ortho-dichlorobenzene;; 1,3-Dichlorobenzene or meta-dichlorobenzene;; 1,4-Dichlorobenzene or para-dichlorobenzene.
Ear drops should only be used in the affected ear. Ear drops are usually used for a short duration of time. Make sure to only use it as prescribed. [7] Cotton buds should not be used to clean the inside of the ear since this can cause inflammation and make things worse. [7] Ear drops should not be used for a ruptured eardrum (a hole or tear in ...
This page was last edited on 18 August 2008, at 18:05 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may ...
Older mothballs consisted primarily of naphthalene, but due to naphthalene's flammability, many modern mothball formulations instead use 1,4-dichlorobenzene.The latter formulation may be somewhat less flammable, although both chemicals have the same NFPA 704 rating for flammability.
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Ear drops are commonly used to treat swimmer's ear. Ear instillation is the process of introducing otic medication or other liquids into the ear canal . Proper care is needed in delivering such liquids.
We tapped doctors, including an allergist and ear, nose, and throat specialists, for more information on the proper nose-blowing technique—including what may happen if you do it the wrong way.
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