请帮我用英语介绍一下盐包括负作用,正能量作用以及介绍.下面这些可供参考.请不要直接翻译,只是供参考.盐是指一类金属离子或

Salt is a kind of metal ions or ammonium ion (NH4+) compounds in combination with ion or non metal ions.Such as sodium chloride,calcium nitrate,ferrous sulfate and ammonium acetate,such as calcium sulfate,cupric chloride,sodium acetate,generally salt is the product of double decomposition reaction (salt and salt reaction to generate new salt and salt,salt and alkali reaction of new salt and alkali,salt reacts with an acid to form a salt and acid),such as sulfuric acid and sodium hydroxide to generate sodium sulfate and water,sodium chloride and silver nitrate of silver chloride and nitric acid reaction.There are other reaction producing salt,such as the replacement reaction.The soluble salt solution conductivity,is because the solution with ion free swimming,therefore can be used as electrolyte.累死我了,要追加分啊