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IBEX Sciences Sodium Hydroxide (NaOH) 0.4 N and 0.5 N Solutions are ready-to-use, standardized volumetric liquid reagents primarily used for acid-base titrations, chemical neutralization, and adjusting pH in clinical, analytical, and industrial laboratories. [1, 2]
Because Sodium Hydroxide is a strong, monoprotic base, its normality (N) is identical to its molarity (M). Therefore, a 0.4 N solution is equivalent to 0.4 M, and a 0.5 N solution is equivalent to 0.5 M. [1, 2, 3]
Key Laboratory Applications
- Volumetric Titration: Acting as standard alkaline titrants to determine the unknown concentration of acidic solutions in quality control or research assays.
- pH Regulation: Utilized to neutralize acidic reaction mixtures or elevate the pH of buffer solutions, diagnostic reagents, and culture media.
- Chemical Processing: Used to saponify fats, hydrolyze proteins, or prepare sample matrices for specific chemical and clinical evaluations.
Technical Specifications
- Formulation Accuracy: Formulated under strict quality control guidelines to guarantee highly precise equivalent weights (0.4 eq/L or 0.5 eq/L), removing the preparation variance associated with weighing hygroscopic sodium hydroxide pellets. [1]
- Carbonate Control: Standardized solutions are typically manufactured using carbon-dioxide-free purified water to prevent the formation of sodium carbonate, which can skew titration endpoints.
Storage, Chemical Stability, and Carbon Dioxide Absorption
- Container Material: These solutions are packaged in high-density polyethylene (HDPE) or specific plastic bottles. They should never be stored long-term in glass containers with ground-glass stoppers, as NaOH can slowly react with and dissolve silica, causing the stopper to fuse permanently to the neck.
- Air Exposure: Bottles must remain tightly capped immediately after dispensing. Open air exposure allows the solution to absorb atmospheric carbon dioxide (CO₂), which forms sodium carbonate (Na₂CO₃) and gradually reduces the effective normality (strength) of the base. [1]
- Storage Temperature: Store at controlled ambient room temperature (15°C to 30°C). [1]
Safety Precautions
- Corrosive Nature: Even at lower normalities like 0.4 N or 0.5 N, sodium hydroxide solutions are caustic. They can cause skin irritation and serious eye damage.
- PPE Requirements: Always wear safety goggles, laboratory coats, and appropriate chemical-resistant gloves (such as nitrile) when handling.
- First Aid: In case of contact with skin or eyes, immediately flush the affected area with copious amounts of running water for at least 15 minutes and seek medical attention if irritation persists. [1, 2]
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