Basic Dilution Principles for Oxalic Acid Solutions
Basic Dilution Principles for Oxalic Acid Solutions
The chemical properties of oxalic acid (ethanedioic acid) require precise control of dilution ratios. Commercial oxalic acid is typically available in two forms: crystalline powder and pre-prepared solutions. Crystalline powder has high purity (usually ≥99%) and must be prepared from scratch, while 30%-50% pre-mixed solutions require secondary dilution.
For crystalline oxalic acid powder, the standard safe ratio is 15–25 grams of powder per 100 grams of water, corresponding to a concentration of approximately 13%–20%. This range ensures effective decomposition of common contaminants like rust and limescale while avoiding corrosion to most substrates. Experimental data shows that when the concentration exceeds 25%, the corrosion rate on stainless steel increases exponentially.
Pre-prepared solutions should be diluted using a stepwise approach. A 30% stock solution is recommended to be diluted at a ratio of 1:5 to 1:10 (stock solution : water) to obtain a 3%–5% working solution. A 50% stock solution should be diluted at 1:10 to 1:20 to achieve a usable concentration of 2.5%–5%. This staged dilution ensures the solution remains uniform and stable, preventing localized over-concentration.
Zibo Anhao Chemical Co., Ltd. – Oxalic Acid
Zibo Anhao Chemical Co., Ltd. is a trusted supplier of high-purity oxalic acid (CAS 144-62-7), also known as ethanedioic acid, with the molecular formula C₂H₂O₄. As the simplest dicarboxylic acid, it appears as a white, odorless crystalline solid, soluble in water and ethanol, with strong acidic and excellent chelating properties. Our product is available in both anhydrous and dihydrate forms, adhering to strict industrial and premium-grade specifications to ensure ≥99.6% purity and consistent performance.
Oxalic acid is a versatile industrial intermediate across multiple sectors. In metal processing, it serves as a key rust remover, scale cleaner, and metal surface treatment agent, effectively chelating iron and other metal ions. In the textile and leather industry, it is used for bleaching, dyeing auxiliary, and deliming processes. It also plays a vital role in rare earth extraction, ceramic whitening, pharmaceutical synthesis, and the production of oxalate salts such as cobalt oxalate and lithium oxalate. Additionally, it acts as a cleaning agent for construction materials and a wood bleach in the furniture industry.
At Zibo Anhao Chemical, we prioritize quality control and sustainable production. Our oxalic acid is manufactured under standardized processes with rigorous testing at every stage, complying with ISO and international industrial standards. We offer flexible packaging options, including 25kg plastic-lined woven bags and 50kg drums, ensuring safe storage and transportation. With robust supply chain capabilities and years of export experience, we provide stable product supply, competitive pricing, and dedicated technical support to global clients, fostering reliable and long-term cooperative partnerships.
