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The IBEX Sciences N/10 Oxalic Acid Solution is a pre-standardized, ready-to-use volumetric reagent primarily utilized in analytical chemistry, clinical biochemistry, and educational laboratories. [1]
The “N/10” notation signifies a 0.1 Normal (0.1 N) concentration. Because oxalic acid dihydrate (\(\text{H}_2\text{C}_2\text{O}_4 \cdot 2\text{H}_2\text{O}\)) is a primary standard, its solution maintains a highly stable and reliable concentration over time, making it an ideal benchmark for volumetric analyses. [1, 2, 3]
Chemical Principles & Specifications
- Molarity vs. Normality: Oxalic acid is a diprotic acid, meaning each molecule can donate two hydrogen ions (\(\text{H}^{+}\)) in an acid-base reaction, or release two electrons in a redox titration. [1, 2]
- Equivalent Weight: Because the molecular weight of crystalline oxalic acid is \(126.07 \text{ g/mol}\), its equivalent weight is exactly half of that, which equals \(63.03 \text{ g/eq}\). [1, 2]
- Concentration Profile: An N/10 solution contains exactly \(0.1\) gram-equivalents of oxalic acid per liter of solution, which translates to \(6.303 \text{ g}\) of pure oxalic acid crystals dissolved per \(1000 \text{ mL}\) of distilled water. [1]
Core Laboratory Applications
- Primary Standard Titrant (Acid-Base): It is routinely used to standardize secondary standard alkaline solutions, such as Sodium Hydroxide (\(\text{NaOH}\)), to determine their exact molarity or normality before complex quantitative assays.
- Redox Titrations (Permanganometry): In a hot, acidic environment, oxalic acid acts as a powerful reducing agent. It is widely used to calibrate and standardize Potassium Permanganate (\(\text{KMnO}_{4}\)) solutions, where it is oxidized into carbon dioxide (\(\text{CO}_{2}\)). [1, 2, 3, 4]
- Equipment & Surface Cleaning: Beyond titrations, the mild reducing properties of oxalic acid make it highly effective at dissolving stubborn metal rust (\(\text{Iron\ III}\) oxides) and mineral scale deposits by forming soluble iron oxalate complexes. [1, 2, 3]
Safe Handling & Storage Guidelines
- Toxicity: Oxalic acid is an organic toxin that can cause severe irritation to the skin, eyes, and respiratory tract upon direct contact. Prolonged exposure or ingestion can lead to localized chemical burns or systemic calcium oxalate precipitation in the kidneys.
- Personal Protective Equipment (PPE): Always wear standard laboratory safety goggles, a protective coat, and nitrile gloves when pipetting or transferring this solution.
- Storage Environment: Store tightly sealed in its original container at a stable room temperature (\(15^{\circ }\text{C}\)–\(30^{\circ }\text{C}\)), away from strong oxidizing agents or concentrated alkaline products. [1, 2, 3]
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