Applications of Sodium Hydroxide (Caustic Soda)

1. Industrial Uses:
• Soap & Detergent Manufacturing: Used to make bar soaps and liquid
detergents by saponifying fats and oils.
• Paper Industry: Helps break down wood pulp in the paper-making process.
• Textile Industry: Used for bleaching and dyeing fabrics.
• Petroleum Industry: Used in refining crude oil and removing impurities.
2. Household Uses:
• Drain Cleaner: Dissolves grease, hair, and organic clogs in pipes.
• Oven Cleaner: Removes burnt food and grease deposits.
3. Food Industry Uses:
• Used to peel fruits & vegetables (e.g., tomatoes, potatoes).
• Gives pretzels their dark, shiny crust.
• Used in cocoa and chocolate processing.
4. Water Treatment:
• Adjusts pH levels in drinking water.
• Helps remove heavy metals and impurities in wastewater treatment.
Disposal Methods for Sodium Hydroxide
1. Neutralization:
• Slowly add a weak acid (such as vinegar or citric acid) while stirring until the
solution reaches a neutral pH (~7).
• Always do this in a well-ventilated area with protective gear.
2. Dilution:
• If disposal regulations allow, dilute small amounts with plenty of water
before pouring it into the drain (check local environmental laws first).
3. Hazardous Waste Disposal:
• For large amounts or industrial use, take it to a hazardous waste disposal
facility.
• Never dispose of it near plants, animals, or water sources, as it can cause
severe damage to the environment.