ester 係 liquid ,,,,點解做實驗,,,,會整左 一層layer ?

At room temperature, small esters are liquid. Among esters, only methyl methanoate is miscible with water, and all others are immiscible with water. In the experiment of making an ester, all reactants and the catalyst are soluble in or miscible with water and thus there is only one liquid layer (aqueous layer). Since the ester formed is immiscible with water and its density is smaller than that of water, the ester forms a liquid layer on the top of the aqueous layer. This is just like oil flows on water to form two liquid layers.

在常溫下，細小的酯呈液態。在眾多酯中，只有甲酸甲酯可與水互溶，其他的酯均與水不互溶。在製備酯的實驗中，所有反應物和催化劑均溶與水或與水互溶，於是只會形成一層液層（水層）。因為所生成的酯不與水互溶，而且密度較水低，所以生成的酯在水層上形成另一液層。這與油和水形成兩個液層的情況一樣。