ethyacetoacetate gives positive test with sodium bisulphate. explain
To explain why ethyl acetoacetate gives a positive test with sodium bisulfite (not sodium bisulphate), we need to understand the underlying chemical reaction.
Sodium bisulfite (NaHSO3) is a chemical compound that can react with compounds containing a carbonyl group (C=O). In this case, ethyl acetoacetate is a compound with a carbonyl group. The reaction between sodium bisulfite and ethyl acetoacetate involves the addition of a bisulfite ion (HSO3-) to the carbonyl group, forming a new compound.
Here's the step-by-step process of the reaction:
1. Sodium bisulfite dissociates in water to form bisulfite ions: NaHSO3 ⇌ Na+ + HSO3-
2. Ethyl acetoacetate has a carbonyl group, which is susceptible to nucleophilic attack by the bisulfite ion. The lone pair of electrons on the sulfur atom in the bisulfite ion (HSO3-) attacks the electrophilic carbon atom of the carbonyl group in ethyl acetoacetate.
3. The nucleophilic attack results in the formation of an adduct compound, which is a combination of ethyl acetoacetate and the bisulfite ion. This new compound is stabilized by intramolecular hydrogen bonding and is responsible for the positive test result.
The positive test is typically indicated by the observation of a color change, often from colorless to yellow or orange. This color change indicates the formation of a new compound resulting from the reaction between ethyl acetoacetate and sodium bisulfite.
It is important to note that the reaction between ethyl acetoacetate and sodium bisulfite is specific to compounds with a carbonyl group. Other compounds that have a similar structure or functional group may also yield positive results with sodium bisulfite.