Sulfuric acid, the molecular formula is H2SO4. It is a colorless and odorless oily liquid, a strong acid, high boiling point, not volatile, soluble in water, and miscible with water in any proportion. Sulfuric acid is one of the important products in basic chemical industry. It is not only used as raw materials for many chemical products, but also widely used in other national economic sectors.

Phosphoric acid or orthophosphoric acid (H3PO4) is a common inorganic acid and a medium strong acid. It is obtained by dissolving phosphorus pentoxide in hot water. Orthophosphoric acid can be obtained by treating apatite with sulfuric acid in industry. Phosphoric acid deliquesces easily in air. Heating will lose water to get pyrophosphate, and further losing water will get metaphosphate. Phosphoric acid is mainly used in pharmaceutical, food, fertilizer and other industries, and can also be used as a chemical reagent.