after extraction with bicarbonate which layer is the benzoin and which is the benzonic acid

To determine which layer contains benzoin and which layer contains benzonic acid after an extraction with bicarbonate, we need to understand their chemical properties.

Benzoin is a neutral compound, while benzonic acid is an acid. In an extraction with bicarbonate, the acid reacts with the bicarbonate to produce carbon dioxide gas and water, resulting in the formation of a salt.

Here's how you can determine which layer contains benzoin and which contains benzonic acid:

1. Perform the extraction by adding the bicarbonate solution to the mixture containing benzoin and benzonic acid. Shake the mixture well and allow the two layers to separate.

2. The aqueous layer (top layer) will contain the benzonic acid salt (as it is water-soluble), while the organic layer (bottom layer) will contain the benzoin.

3. Carefully separate the two layers using a separatory funnel or by pouring one layer into another container without transferring the other layer.

4. Evaporate the solvent from the organic layer to obtain the solid benzoin. This can be done by gently heating the organic layer or by using a rotary evaporator.

5. The aqueous layer containing the benzonic acid can be neutralized with an acid (e.g., hydrochloric acid), followed by acidification with a mineral acid (e.g., sulfuric acid) to obtain the solid benzonic acid.

It's important to note that this extraction process assumes that the benzoin and benzonic acid are initially dissolved in an appropriate solvent, and the pH of the mixture is adjusted to favor the extraction process.