What is sulfuric acid used for?

Sulfuric acid is a relatively common chemical substance that plays an important role in many fields. For example, it is often the base fertilizer for crops and plays a relatively important role in many other chemical fields. It is also a relatively common acid in laboratories. Because sulfuric acid is highly corrosive, it must be used in strict accordance with operating specifications.

What is sulfuric acid used for?

1. Used as base fertilizer for crops: When ammonium sulfate is used as base fertilizer, it should be applied deeply and covered with soil to facilitate crop absorption. 2. Used as top dressing for crops: Ammonium sulfate is most suitable for use as top dressing for crops. The amount of ammonium sulfate topdressing needs to be determined according to different soil types. For soils with poor water and fertilizer retention properties, topdressing should be done in stages, and the amount applied each time should not be too much; for soils with good water and fertilizer retention properties, the amount applied each time can be appropriately more. The amount of soil moisture also has a great impact on the effectiveness of fertilizers, especially in dry land. When applying ammonium sulfate, be sure to water the soil in a timely manner. When applying topdressing to paddy fields, the water should be drained first, and attention should be paid to applying the fertilizer simultaneously with plowing and harrowing. In addition, there are obvious differences in the application of ammonium sulfate to different crops. For example, when used on fruit trees, it can be applied in furrows, rings or holes.

Physical properties

Pure sulfuric acid is generally a colorless oily liquid with a density of 1.84 g/cm3 and a boiling point of 337°C. It is miscible with water in any proportion and releases a large amount of heat, causing the water to boil. When heated to 290°C, sulfur trioxide begins to be released, eventually becoming a 98.54% aqueous solution, boiling at 317°C to form an azeotropic mixture.

The boiling point and viscosity of sulfuric acid are relatively high because of the strong hydrogen bonds within its molecules. Due to its high dielectric constant, sulfuric acid is a good solvent for electrolytes, but a less ideal solvent for non-electrolytes. The melting point of sulfuric acid is 10.371°C. Adding water or sulfur trioxide will lower the freezing point.