Phosphoric Acid
Phosphoric Acid Supplier
Phosphoric Acid (H₃PO₄) is a medium-strength mineral acid and the backbone of the global phosphate industry. From fertilizer production and food-grade acidulants to rust removal and industrial cleaning, its versatility and wide range of approved uses make it one of the most important acids in commerce. With more than 75 years of experience as a pioneering innovator, Alexander Chemical supplies top-quality Phosphoric Acid in liquid form, backed by expert technical guidance and reliable bulk delivery services. Safety and compliance are our top priorities.
Key Characteristics of Phosphoric Acid
Chemical Properties
- Phosphoric Acid Formula: H₃PO₄
- Appearance: Clear, colorless to slightly yellow, viscous liquid
- Odor: Odorless to faintly acidic
- Solubility: Miscible with water in all proportions
- pH: Moderately acidic (pH ~1.5 at 85% concentration)
- Common Concentrations: 75–85% (industrial grade); 85% (food grade)
Storage & Handling Requirements
- Store in HDPE, stainless steel, or lined carbon steel tanks
- Keep away from strong bases and oxidizing agents
- Avoid contact with reactive metals at elevated concentrations
Phosphoric Acid is a hazardous material. A corrosive acid that causes skin and eye burns on contact. Less reactive than strong oxidizing acids but still requires careful handling and compatible storage. Mishandling can lead to serious safety and environmental risks. Always rely on certified professionals for storage, handling, and transportation.
What are the Uses of Phosphoric Acid?
Phosphoric Acid is one of the most versatile industrial acids in the world, applied across agriculture, food and beverage, metal treatment, cleaning, and numerous other sectors.
Fertilizer Production
Approximately 85% of global phosphoric acid production goes into the manufacture of phosphate fertilizers — including superphosphate, triple superphosphate, and ammonium phosphates. Phosphorus is an essential macronutrient for plant growth, and phosphoric acid derived from phosphate rock is the primary pathway to delivering it to agricultural soils globally.
Food & Beverage
Food-grade phosphoric acid is approved by the FDA as an acidulant, flavoring agent, and pH control substance. It is most famously responsible for the sharp, tangy flavor of cola beverages and is also used in jams, cheeses, and other processed foods. Its mild acidity and food safety profile make it a widely preferred acidulant.
Rust Removal & Metal Treatment
Phosphoric acid reacts with iron oxide (rust) to form insoluble iron phosphate — a stable compound that adheres to the metal surface and inhibits further corrosion. This makes it an effective rust converter and a common ingredient in rust removers, metal primers, and surface preparation products. It is also used in aluminum brightening and anodizing processes.
Industrial Cleaning & Detergents
Phosphoric acid is used for descaling, removal of mineral deposits, and cleaning of food processing equipment, dairy equipment, and stainless steel surfaces. Phosphate compounds derived from it serve as builders in laundry and dishwashing detergents.
Dental & Pharmaceutical Applications
Phosphoric acid is used in dentistry as an etchant to prepare tooth enamel for bonding procedures and dental restorations. Pharmaceutical applications include its use in pH adjustment, mineral supplementation, and as an ingredient in certain medicines.
Other Industrial Applications
- Water treatment and scale inhibition
- Semiconductor and electronics manufacturing
- Animal feed supplements
Bulk Phosphoric Acid Delivery & Support Services
The professionals at Alexander Chemical bring decades of experience and expertise to managing Phosphoric Acid with precision and care. We supply and deliver to municipal utilities, industrial facilities, and specialty operations across the country.
What We Offer
- Supplying and delivering Phosphoric Acid in bulk tankers, totes, or drums tailored to your specific requirements
- On-site technical support for optimal dosing and application
- Regulatory compliance guidance and safety training
- Regular tank inspections and maintenance recommendations
A Brief History of Phosphoric Acid
The story of phosphoric acid is intertwined with one of chemistry’s most remarkable discoveries. In 1669, German alchemist Hennig Brandt accidentally discovered elemental phosphorus while distilling large quantities of urine in search of the philosopher’s stone. Johan Gottlieb Gahn and Carl Wilhelm Scheele later identified phosphoric acid in bone ash around 1770. Industrial production developed rapidly in the 19th century, initially by treating bone char with sulfuric acid. The dominant modern method — the wet process, in which phosphate rock is reacted with sulfuric acid — was developed in the mid-19th century and today accounts for the vast majority of global production. Phosphoric acid remains one of the most strategically important industrial chemicals, as global food security depends on the phosphate fertilizer production it enables.
Phosphoric Acid Facts
- Cola’s Secret: Phosphoric acid (E338) gives cola its distinctively sharp, acidic bite. A typical can has a pH of around 2.5 — more acidic than lemon juice — though sugar masks the sourness.
- Rust Converter: Phosphoric acid doesn’t just remove rust — it chemically transforms it into a stable iron phosphate that actually protects the metal surface from further corrosion, unlike acids that simply dissolve the oxide layer.
- The Triprotic Acid: Phosphoric acid can donate three hydrogen ions per molecule — making it exceptionally versatile as a buffer and allowing it to form three distinct series of phosphate salts, each with different industrial applications.
- Life’s Energy Currency: Phosphate groups derived from phosphoric acid form the backbone of ATP — the molecule that stores and transfers energy in every living cell. In a very real sense, phosphoric acid chemistry is fundamental to life itself.
- Started with Urine: Phosphorus — the elemental precursor to phosphoric acid — was first discovered in 1669 by Hennig Brandt, who distilled approximately 1,200 gallons of human urine to isolate a tiny quantity of the glowing element.
Frequently Asked Questions about H₃PO₄
What is phosphoric acid?
Phosphoric acid (H₃PO₄) is a medium-strength, non-oxidizing mineral acid produced industrially from phosphate rock via the wet process or from pure phosphorus via the thermal process. It is supplied as a viscous, colorless to pale yellow liquid in concentrations of 75–85% for industrial use, with food-grade versions available at 85%.
What is phosphoric acid used for?
Phosphoric acid’s largest use — about 85% of production — is in the manufacture of phosphate fertilizers. It is also widely used as a food-grade acidulant in beverages and processed foods, as a rust remover and metal treatment agent, in industrial cleaning formulations, and in dental and pharmaceutical applications.
Is phosphoric acid food safe?
Yes. Food-grade phosphoric acid is approved by the FDA for use as an acidulant, pH control agent, and flavoring substance in food and beverage production. It must meet food-grade purity specifications. Alexander Chemical can advise on food-grade availability and compliance.
What is the difference between food-grade and industrial-grade phosphoric acid?
Food-grade phosphoric acid meets stricter purity specifications — particularly regarding heavy metal content — required for direct food contact applications. Industrial-grade phosphoric acid is produced to broader specifications and is used in fertilizer production, metal treatment, and other non-food applications.
How is phosphoric acid delivered?
Alexander Chemical delivers phosphoric acid via bulk tankers, intermediate bulk containers (totes), and drums based on your volume and site requirements. All deliveries are handled through Circle Transport, our dedicated logistics partner.
How should phosphoric acid be stored?
Phosphoric acid should be stored in HDPE, stainless steel, or lined carbon steel tanks, away from strong bases and oxidizing agents. Alexander Chemical provides tank inspection and maintenance support as part of our delivery and compliance services.
What industries use phosphoric acid?
Phosphoric acid is used across agricultural chemicals (fertilizers), food and beverage production, metal treatment and finishing, industrial cleaning and detergents, dental and pharmaceutical applications, water treatment, and semiconductor manufacturing.
Where to buy phosphoric acid in bulk?
Alexander Chemical supplies bulk phosphoric acid with nationwide delivery. Contact our team to discuss your volume requirements, delivery schedule, and pricing.