Acid-base titrations are widely used in analytical chemistry to determine the concentration of an unknown acid or base solution. This technique is based on the neutralization reaction between the acid and the base, where the concentration of one of the species is known and the other is unknown. The process involves slowly adding a solution of known concentration to a solution of unknown concentration until the equivalence point is reached. The equivalence point is the point where the number of moles of acid and base in the solution are stoichiometrically equal.