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cyt91
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In the synthesis of ester, how does conc. aqueos calcium chloride remove excess ethanol? I tried google, and found out that a complex is formed. How is this possible? If then what exactly is the complex formed? Thanks. 
Conc. aqueous calcium chloride is added to the reaction mixture in order to remove any excess water. This is important because water can hinder the reaction and decrease the yield of ester.
Conc. aqueous calcium chloride is a hygroscopic compound, meaning it has the ability to absorb water. In the reaction mixture, it will absorb any water present, forming a solution of calcium chloride and water which can be easily separated from the ester product.
Yes, other compounds such as molecular sieves or anhydrous magnesium sulfate can also be used to remove excess water in the synthesis of ester. However, conc. aqueous calcium chloride is a commonly used and effective option.
Yes, it is important to remove as much water as possible in order to achieve a high yield of ester. Even small amounts of water can decrease the yield significantly.
Yes, conc. aqueous calcium chloride can irritate the skin and eyes, so it is important to wear protective gloves and eyewear when handling it. It is also important to handle it in a well-ventilated area as it can release harmful fumes.