Neutralization reaction refers to the reaction of acid and alkali exchange components to form salt and water (acid+alkali → salt+water). Its essence is that H+ (hydrogen ion) and OH- (hydroxide ion) combine to generate water in neutralization reaction, and complete neutralization reaction means that acid and alkali react completely. In practical production and application, people often use neutralization reaction to improve soil acidity, treat hyperacidity and treat wastewater.
Reaction principle: After acid and alkali are dissolved in water, they are ionized into free-moving anions and cations. For example, HCl (hydrochloric acid) is ionized into hydrogen ions (H+) and chloride ions (Cl-), and NaOH (caustic soda) is ionized into sodium ions (Na+) and hydroxide ions (OH-). Hydrogen ions and hydroxide ions combine to form water that is extremely difficult to ionize, so what is left in the solution is sodium ions and chloride ions. Sodium ions and chloride ions are still ionized in the solution and will not combine. But the product is NaCl (salt). So the essence of neutralization reaction is that acid and alkali react to produce salt and water.