Sodium Hydroxide 50% Solution ACS Grade

Product Overview

Sodium Hydroxide 50% Solution ACS Grade is a highly concentrated alkaline solution designed for demanding industrial and laboratory applications. This clear, colorless to slightly yellow liquid dissolves readily in water, forming a strong base that provides rapid hydroxide ion availability for pH adjustment, etching, saponification, and analytical procedures. With ACS-grade purity, it supports high-purity requirements in chemical manufacturing, cleaning, and environmental processes, while maintaining a stable pH profile across typical operating ranges. The solution is supplied in HDPE or glass containers and is formulated to minimize trace contaminants, aligning with stringent quality expectations and compliance standards such as ACS Reagent Grade and USP-NF Monograph specifications.

The product is designed for accurate dosing in industrial systems, with a specific gravity around 1.515 at 20°C and an assay wt% closely centered on 50% (min 49%, max 51%, typical 50%). Its low residue after ignition and tightly controlled heavy metal content support use in sensitive processes where product purity is critical. Regular quality checks, including ICP-OES/ICP-MS metal analyses and IC/ISE anion testing, ensure ongoing compliance with target specifications. The formulation supports robust alkaline strength for a wide range of process applications while maintaining safety and handling standards expected in ACS-grade caustic soda solutions.

Key Properties

• Property Name: Assay wt %
• Chemical Formula: NaOH
• Molecular Weight: 40.00 g/mol
• Boiling Point: N/A
• Specific Gravity: 1.515 (20°C; min 1.50, max 1.52)
• Color (APHA/Hazen): Typical 3, Max 5
• Residue After Ignition: Max 0.01 wt% (typical 0.005)
• Chloride (ppm): Max 0.5 (typical 0.2)
• Nitrate NO3 (ppm): Max 1 (typical 0.5)
• Ammonium NH4 (ppm): Max 0.5 (typical 0.2)
• Sulfate SO4 (ppm): Max 2 (typical 0.8)
• Phosphate PO4 (ppm): Max 1 (typical 0.3)
• Arsenic (As) ppm: Max 0.01 (typical 0.005)
• Heavy Metals (as Pb) ppm: Max 0.1 (typical 0.02)
• Iron Fe (ppm): Max 0.2 (typical 0.05)
• Copper Cu (ppm): Max 0.2 (typical 0.05)
• Manganese Mn (ppm): Max 0.2 (typical 0.05)
• Nickel Ni (ppm): Max 0.2 (typical 0.05)
• Lead Pb (ppm): Max 0.2 (typical 0.05)
• Zinc Zn (ppm): Max 0.5 (typical 0.1)
• Aluminum Al (ppm): Max 0.5 (typical 0.1)
• Chromium Cr (ppm): Max 0.2 (typical 0.05)
• Cobalt Co (ppm): Max 0.1 (typical 0.02)
• Calcium Ca (ppm): Max 1 (typical 0.3)
• Magnesium Mg (ppm): Max 1 (typical 0.3)
• Sodium Na (ppm): Max 0.5 (typical 0.2)
• Substances Reducing Permanganate: Passes test
• Sulfurous Acid H2SO3 (ppm): Max 1 (typical 0.3)
• Available Chlorine wt %: Min 0, Max 0 (typical 0)
• Free Alkali NaOH wt %: Min 98, Max 100 (typical 99.5)

Common Applications

• Application Category: pH Adjustment – Water Treatment: Used to raise the pH of acidic water in treatment processes, enabling optimized coagulation, corrosion control, and process stability in municipal and industrial water systems.
• Application Category: Chemical Manufacturing – Industrial: Serves as a key reactant in the production of various chemicals, including processing of polymers, catalysts, and specialty reagents requiring strong basic conditions.
• Application Category: Soap Production – Cosmetics: Utilized in the saponification process to produce soap, providing reliable fatty acid ester hydrolysis and soap yield with controlled alkalinity.
• Application Category: Laboratory Reagent – Analytical Chemistry: Commonly used in titrations and other analytical procedures, where ACS-grade caustic soda provides precise base strength for endpoint determination.
• Application Category: Cleaning Agent – Industrial Cleaning: Effective for removing grease, organics, and scale from equipment and process lines where high-pH cleaning enhances contaminant dissolution.

Safety Precautions

Handle with appropriate PPE including chemical resistant gloves, splash goggles, and protective clothing. Store in a cool, dry place away from acids and organic materials, in suitable HDPE or glass containers with proper venting. Ensure adequate ventilation during handling to minimize inhalation exposure to vapors and employ spill containment measures in accordance with SDS guidelines.

In case of exposure, follow standard first aid procedures: for eyes, rinse cautiously with water for several minutes and remove contact lenses if present; for skin, wash with soap and water and seek medical attention if irritation persists; for inhalation, move to fresh air and seek medical attention if symptoms persist; for ingestion, rinse mouth and do not induce vomiting, seek medical attention immediately. Transportation follows UN 1824 Sodium hydroxide solution, Class 8, PG II.

Benefits

✔ High Purity ACS Grade – Meets ACS Reagent Grade and USP-NF Monograph standards, ensuring low trace metal content for sensitive applications.
✔ Concentrated Alkaline Solution – 50% NaOH provides efficient pH adjustment and strong base availability in a single solution, reducing handling steps in process flows.