Sodium Hydroxide 25% ACS Grade

Product Overview

Sodium Hydroxide 25% ACS Grade is a highly concentrated aqueous solution of NaOH, a strong inorganic base used across chemical manufacturing and analytical platforms. This ACS-grade product is formulated to meet stringent purity requirements, with a typical assay of 25% w/w NaOH and low impurity levels suitable for sensitive applications such as titration, pH control, and chemical synthesis. The solution exhibits clear, colorless to slightly yellow appearance and is odorless, enabling safe handling in laboratory and industrial environments. The solution’s density at 25°C is approximately 1.2 g/mL, and its viscosity is about 1.0 cP, facilitating accurate dosing and predictable flow characteristics in process lines. The product is prepared to minimize contaminants that could interfere with analytical results or catalytic processes, aligned with ACS Reagent Grade and USP-NF monograph expectations.

In addition to its strong basicity (pKa ~14.0 in water), the 25% NaOH solution is optimized for activities that require reliable pH adjustment, caustic washing, and preparation of caustic formulations for cleaning, soap and detergent production, and specific chemical syntheses. The solution is stable under proper storage conditions and is commonly used in water treatment for neutralization and pH stabilization, as well as in laboratory settings as a robust reagent for analytical procedures. The product is supplied with documentation that supports traceability, quality assurance, and compliance with industry standards to support industrial and institutional users.

Key Properties

• Appearance: Clear, colorless to slightly yellow liquid
• Odor: Odorless
• Molecular Weight: 40.00 g/mol
• Density (25°C): 1.2 g/mL
• Solubility: Soluble in water
• Viscosity (25°C): 1.0 cP
• Refractive Index (20°C): 1.335
• Freezing Point: -15°C
• Boiling Range: N/A
• Decomposition Temperature: > 300°C
• pKa: 14.0
• CAS: 1310-73-2

Common Applications

• pH Adjustment – Water Treatment: Used to neutralize acidic water and maintain optimal pH levels in municipal and industrial water treatment processes, providing predictable buffering and corrosion control.
• Chemical Synthesis – Base for Reactions: Serves as a strong base in the production of chemicals, including soaps, detergents, and various organic synthesis pathways requiring caustic conditions.
• Cleaning Agent – Industrial Cleaning: Formulated into cleaning solutions for degreasing and removal of organic contaminants in manufacturing, electronics, and maintenance environments.
• Laboratory Reagent – Analytical Chemistry: Employed in titration, standardization, and various analytical protocols where precise alkalinity is required.
• Food Processing – pH Control: Utilized as a processing aid and pH control agent in compliant food processing environments where permitted.

Safety Precautions

Handle and store Sodium Hydroxide 25% ACS Grade in a cool, dry place away from incompatible substances. Use containers made of HDPE or glass, and ensure adequate ventilation in storage and handling areas. Wear appropriate PPE, including chemical-resistant gloves, splash-resistant goggles, and protective clothing to prevent skin and eye contact. Maintain containment measures to manage spills and avoid moisture exposure which can alter concentration and increase caustic hazards. Follow established SDS-backed procedures and ensure safe transfer practices to minimize exposure during handling and dosing.

When exposure occurs, immediately rinse contaminated skin or eyes with copious water for several minutes and seek medical attention as needed. In case of ingestion, do not induce vomiting unless directed by a medical professional; rinse mouth and seek urgent medical advice. In the event of a spill, evacuate the area, contain the spill with inert absorbent material, and neutralize with appropriate quenching agents under trained supervision, then dispose of waste in accordance with local regulations. Transport should be in accordance with UN 1824 Sodium hydroxide solution, Class 8, PG II.

Benefits

✔ High Purity ACS Grade – Meets or exceeds ACS Reagent Grade and USP-NF requirements for reliable analytical and manufacturing performance.
✔ Consistent Concentration – Typical 25% w/w NaOH with controlled assay (24.5–25.5%) enabling accurate dosing and reproducible results.
✔ Low Impurity Profile – Tight impurity specifications (e.g., chlorides, nitrates, sulfates, heavy metals) minimize contamination risk in sensitive processes.
✔ Excellent Stability – Stable under proper storage conditions with a long shelf life of 24 months when stored correctly.