Sodium Bicarbonate[4]
Overview
Sodium bicarbonate (NaHCO3) is a white, crystalline powder with a slightly salty, alkaline taste. It is a naturally occurring mineral but is commonly produced industrially through the Solvay process. Its versatility stems from its mild alkalinity, solubility, and reactivity with acids, making it indispensable in food, medicine, and industrial applications. Historically, sodium bicarbonate has been used since ancient times for cleaning and baking. Today, it is manufactured globally, with major producers in the U.S., China, and Europe. Its non-toxic nature and low cost contribute to its widespread use across multiple sectors.
Physical and Chemical Properties
Sodium bicarbonate is stable under normal conditions but decomposes at temperatures above 50°C, releasing carbon dioxide and forming sodium carbonate. This property makes it effective as a leavening agent in baking. It has a pH of 8.4 in aqueous solution, acting as a buffer to neutralize acids. The compound is highly soluble in water (9.6 g/100 mL at 20°C) but only slightly soluble in organic solvents like ethanol. Its density is 2.20 g/cm³, and it exhibits effervescence when exposed to acids, a reaction exploited in fire extinguishers and antacid medications.
Main Applications
In the food industry, sodium bicarbonate serves as a leavening agent in baked goods, a pH regulator in beverages, and a tenderizer in meats. Pharmaceutical uses include antacids for heartburn relief and as an ingredient in dialysis solutions. Industrially, it is employed in fire extinguishers (Class B fires), odor control, and water treatment. Its mild abrasive properties make it a key component in eco-friendly cleaning products. In agriculture, it functions as a fungicide and soil conditioner.
Safety and Storage
Sodium bicarbonate is generally recognized as safe (GRAS) by the FDA but may cause eye or respiratory irritation in powder form. Prolonged skin contact should be avoided to prevent dryness. Storage requires a cool, dry environment away from acids and moisture to prevent premature decomposition. Bulk storage should use airtight containers to prevent caking. For industrial-grade material, ensure compliance with local regulations for chemical handling. Spills can be cleaned with water, as the compound is non-hazardous to the environment.
B2B Procurement Guide
When procuring sodium bicarbonate, buyers should specify the required grade (food, pharmaceutical, or industrial) and purity (typically 99%-99.9%). Food-grade material must meet FCC or USP standards, while industrial-grade may tolerate higher impurity levels. Suppliers often offer bulk quantities (25 kg bags, 1-ton pallets) with discounts for large orders. Key procurement considerations include lead times (commonly 2-4 weeks), transportation costs (due to bulk density), and supplier certifications (ISO, GMP). Spot prices fluctuate with raw material (soda ash) costs and regional demand.