The dehydration of ethanol to give ethene Ethanol is heated with an excess of concentrated sulphuric acid at a temperature of 170Â°C. The gases produced are passed through sodium hydroxide solution to remove the carbon dioxide and sulphur dioxide produced from side reactions.
Iran is a multi-ethnic and multicultural country. The northwestern region, Azerbaijan, is largely populated by Iranian Azeris, who are a Turkic people closely related to the people of Azerbaijan republic and Turkey.
Furthermore, there are recent immigrant groups, arriving in the 20th to 21st century, such as Russians, Turks, Koreans, Iraqis, etc. Some of the main ethnic groups in Iran are also religious minorities. For instance, the majority of Kurds, Baluchis and Turkmen are Sunni Muslims and the Armenians are Christian, while the state religion in Iran is Shi'a Islam. Some of these groups, however, have large Shi'a minorties, and the overwhelming majority of Persians and Azeris are Shi'a.