Phosphoric Acid 75%

Product Overview

Phosphoric Acid 75% is a clear, colorless liquid of high purity designed for precise acidulant and reagent applications across industrial processes. As a triprotic acid (H₃PO₄), it offers robust buffering capacity and controlled acidity for pH adjustment, chemical synthesis, and metal surface treatment. The 75% solution balances performance and handling characteristics, delivering consistent titratable acidity (assay wt pct 74–76%, typical 75%) and a low visual color (color alpha max 15, typical 8) to ensure reproducible results in critical formulations. Its density and viscosity are suitable for reliable dosing in closed systems, while the low vapor pressure minimizes volatilization under standard process conditions. The product is compatible with water-based systems and can be stored and transported in common HDPE or glass containers, aligning with industry practices for ACS Reagent Grade materials.

With a specified range for pH (20 °C) between 1 and 2 (typical 1.5), Phosphoric Acid 75% supports precise control of acidic environments in water treatment, fertilizer production, and food-processing contexts. The product is designed to meet stringent quality standards and to minimize extractables; typical residue after ignition remains well below 0.05 wt% (typical 0.01). The solution’s clear appearance, odorless profile, and controlled impurity levels (including low heavy metals and non-detect chlorine species in certain analyses) enable its use in sensitive applications such as fertilizer manufacturing and processed foods, while ensuring robust regulatory compliance when combined with appropriate handling procedures.

Key Properties

• Chemical Formula: H₃PO₄
• Molecular Weight: 97.99 g/mol
• Boiling Point: 158 °C
• Specific Gravity: 1.58 (at 20 °C)
• Density (25 °C): 1.685 g/mL
• Appearance: Clear, colorless liquid
• Odor: Odorless
• pH (20 °C, 10% w/w solution): 1–2 (typical 1.5)
• Residue After Ignition: ≤ 0.05 wt% (typical 0.01)
• Chloride (Cl⁻): ≤ 1000 ppm (typical 200 ppm)
• Nitrate (NO₃⁻): ≤ 500 ppm (typical 100 ppm)
• Ammonium (NH₄⁺): ≤ 100 ppm (typical 20 ppm)
• Sulfate (SO₄²⁻): ≤ 1000 ppm (typical 200 ppm)

Common Applications

• Application Category: PH Adjustment – Water Treatment: Used to adjust pH levels in mixed-sorbent and recirculating water systems to optimize coagulation, corrosion control, and disinfection efficacy.
• Application Category: Fertilizer Production – Agriculture: Key reagent in phosphate fertilizer synthesis and processing, enabling phosphate rock dissolution and acidulation steps.
• Application Category: Food Additive – Food Industry: Employed as an acidity regulator and processing aid in a range of beverages and prepared foods, compliant with applicable regulations when used within specified limits.
• Application Category: Chemical Synthesis – Chemical Manufacturing: Reagent for esterification, phosphorylation, and dehydration reactions, facilitating controlled reaction environments and catalyst systems.
• Application Category: Metal Treatment – Metal Finishing: Utilized in cleaning, degreasing, and etching processes to prepare metal surfaces for coatings and subsequent treatments.

Safety Precautions

Handle Phosphoric Acid 75% with appropriate PPE, including chemical-resistant gloves, splash goggles, and a face shield where exposure risk is anticipated. Store in a cool, dry location in compatible containers (HDPE or glass) away from bases and oxidizers, with proper ventilation to minimize vapor buildup. Follow established spill response procedures and use inert absorbents for containment; flush with water while avoiding entry into drains or waterways. Use secondary containment in storage and ensure that container labeling remains clear and legible to prevent cross-contamination or misapplication.

For exposure and emergency response, consult the SDS: the product is categorized with GHS classifications including Skin Corr. 1A, Eye Dam. 1, and Metal Corr. 1. In case of skin or eye contact, rinse immediately with copious water for several minutes and seek medical attention if irritation persists. If inhaled or ingested, move to fresh air and seek medical consultation. In case of ingestion, do not induce vomiting; rinse mouth and seek medical attention promptly. Transport classification is UN 1805, Phosphoric acid solution, Class 8, PG II.

Benefits

✔ High Purity ACS Reagent Grade – Meets or exceeds standards in Reagent Chemicals, 11th Edition, ensuring reliable performance in analytical and manufacturing processes.
✔ Consistent Acid Strength – Well-defined assay (74–76 wt%, typical 75) and stable pH profile at 20 °C enable precise process control and reproducibility.
✔ Low Impurity Profile – Low heavy metals and trace impurities minimize contamination risks in sensitive applications such as food processing and pharmaceutical intermediate workups.