No
Yes, the sea does contain salt water.
Yes, some brands of sparkling water may contain citric acid as an ingredient for flavoring.
Water.
no they contain very high toxic acid
Watermelons do not contain citric acid. They have a high water content and are composed mainly of water, natural sugars, and dietary fiber.
Yes, acetic acid and alcohol solutions commonly contain water, as water is often used as a solvent for these compounds. The presence of water in the solution can depend on the concentration of acetic acid and alcohol used.
http://wiki.answers.com/Q/Why_sea_water_salt_contain ?
Yes, rain can contain acid due to pollutants in the atmosphere mixing with water vapor to form acidic rain.
neutral.
yes
Sulfuric acid, hydrochloric acid, citric acid ...
Nothing that you eat contains nitric acid - the stuff is terribly toxic and corrosive.