Acid Base Extraction

There are two objectives of acid-base extraction in this laboratory, first explaining the extraction of acid and base and finally deciding which unknowns exist. Next, I will extract caffeine from tea. These two tasks are recorded in two separate entities. Introduction: Acid / alkali extraction involves a simple acid / base reaction to separate strong organic acids, weak organic acid neutral organic compounds and basic organic substances.

Acid-base extraction is a method of purifying organic bases of organic acids and organic mixtures. This is a procedure for purifying acids and bases from mixtures using sequential liquid-liquid extraction based on chemical nature and solubility in molecular and ionic form. Acid-base extraction is usually done after chemical reaction. As long as their pKa (or pKb) constants are sufficiently large, acid-base extraction procedures can also be used to separate very weak acids from strong bases and isolate very weak bases from weak bases.

For acid catalysts and basic catalysts, the chemical reaction is catalyzed by acid or base. The acid is a proton donor and the base is a proton acceptor, called Bronsted-Lowry acid and base, respectively. Typical reactions catalyzed by proton transfer are esterification reaction and aldol reaction. In these reactions, the conjugate acid of the carbonyl group is a better electrophile than the neutral carbonyl. The catalysis of acids or bases can occur in two different ways: specific catalysis and general catalysis. Many enzymes pass acid catalysis

In the Bronsted - Lowry acid - base theory, the acid - base reaction involves the transfer of a proton (H +) from one species (acid) to another species (acid). Once the protons are removed from the acid, the resulting material is called the conjugate base of the acid. When a proton is accepted by a base, the resulting material is called a base conjugate acid. In other words, the acid acts as a proton donor and the base acts as a proton acceptor. According to the following formula: Since the reaction is possible, the acid / base and the conjugate base / acid are always in equilibrium. The equilibrium is determined by the dissociation constants (Ka and Kb) of the acids and bases of the substances involved. A special case of acid-base reaction is neutralization, where acid and base form exactly the same amount of neutral salt.