Sodium Hydroxide[5]

Updated: 2026-09-12

Overview

Sodium hydroxide (NaOH), commonly known as caustic soda, is one of the most widely used industrial chemicals. It is a strong base with significant applications across multiple industries due to its reactivity and alkalinity. The compound is produced through the electrolysis of sodium chloride (salt) solution in the chloralkali process. Its versatility makes it essential in chemical synthesis, pH regulation, and cleaning applications.

Physical and Chemical Properties

Sodium hydroxide is a white, odorless solid at room temperature, available in pellets, flakes, or solutions. It is highly soluble in water, releasing heat upon dissolution. The compound is hygroscopic, absorbing moisture and carbon dioxide from the air. As a strong base, NaOH readily reacts with acids to form salts and water. It also reacts with amphoteric metals like aluminum, and can saponify fats and oils, making it valuable in soap production.

Main Applications

In the chemical industry, sodium hydroxide is used for pH adjustment, neutralization reactions, and as a reactant in producing various chemicals like sodium salts and soaps. The pulp and paper industry relies on it for wood pulping processes. Water treatment plants use NaOH for pH control and heavy metal precipitation. Other applications include food processing (peeling fruits and vegetables), biodiesel production, and cleaning agent formulation.

Safety and Storage

Sodium hydroxide is highly corrosive and requires careful handling. Proper PPE including gloves, goggles, and protective clothing should always be worn. Spills should be neutralized with weak acids like vinegar. Store in cool, dry conditions in tightly sealed containers to prevent moisture absorption and reaction with CO₂. Keep away from acids and metals like aluminum. Solutions should be stored in corrosion-resistant containers, preferably plastic or rubber-lined steel.

B2B Procurement Guide

Industrial buyers should specify required purity (technical grade, food grade, or reagent grade) and form (solid or solution concentration). Transportation costs are significant for liquid NaOH due to its weight. Consider supplier certifications, batch consistency, and logistics capabilities. Long-term contracts may secure better pricing. For large quantities, tanker deliveries of 50% solution may be most economical, though on-site dilution equipment would be needed.