Phosphoric V Acid

Phosphoric acid

Phosphoric v acidis a strong ternary acid that undergoes three-step ionization, is not easily volatile or decomposed, and has certain oxidizing properties. Has acid permeability.

pKa1：2.12

pKa2：7.21

pKa3：12.67

(1) Concentrated phosphoric acid can co heat with sodium chloride to generate hydrogen chloride gas (similar reactions with potassium iodide, sodium bromide, etc.), which belongs to the high boiling point acid to low boiling point acid production:

NaCl+H3PO4 (concentrated)=△==NaH2PO4+HCl ↑

Principle: Preparation of volatile acids from non volatile acids

(2) Phosphate ions have strong coordination ability and can form soluble complexes with many metal ions. Fe3+and PO43- can form colorless soluble complexes [Fe (PO4) 2] 3- and [Fe (HPO4) 2] -. By utilizing this property, PO43- is commonly used in analytical chemistry to mask Fe3+ions. Concentrated phosphoric acid can dissolve tungsten, zirconium, silicon, iron silicide, etc., and form complexes with them.

(3) phosphoric v acid dehydrates under strong heat, generating pyrophosphoric acid, triphosphate, and polyphosphoric acid in sequence. Triphosphate has a chain like structure, while polyphosphoric acid has a cyclic structure.

2H3PO4==473-573K==H4P2O7+H2O

3H3PO4==573K or above==H5P3O10+2H2O

4H3PO4==high temperature==(HPO3) 4+4H2O

(4) It should be noted that concentrated hot phosphoric acid can corrode silica and generate heteropolyacids. However, due to the overly complex reaction principle, the middle school curriculum simplified it to hydrofluoric acid being the only acid that can react with silica. Concentrated phosphoric acid can also decompose most minerals, such as chromite, rutile, ilmenite, etc.

Phosphoric v acid is mainly used in pharmaceutical, food, chemical fertilizer production, etc. [1], and can also be used as a chemical reagent, phosphate is the nutrition of all life forms.

The production process of phosphoric acid has always been influenced by the geographical distribution of raw materials. The production of phosphoric acid in China is mainly concentrated in Yunnan, Sichuan, Guizhou, and Hubei, while the refined application of phosphoric acid is mainly concentrated in coastal areas. According to a survey report by the China Phosphorus Exchange, the main production of phosphoric acid in China is thermal phosphoric acid, which purifies high-purity phosphoric acid to meet industrial needs.

                               Thanks for your visit and welcome your kind inquiry!

Hot Tags: phosphoric v acid, China phosphoric v acid manufacturers, suppliers, factory