What is K2SO3? Important knowledge about K2SO3

1. Definition of K₂SO₃:

K₂SO₃ is the chemical formula of potassium sulfite. In this compound, potassium (K) and sulfite (SO₃) are the two ions that form the salt. The potassium ion has a valency of (+1) while the sulfite ion has a valency of (-2). This compound is also referred to as potassium sulfite or potassium sulphite in English. The atomic mass of potassium is 39.0983, sulfur is 32.06, and oxygen is 15.9994, so the molecular weight of K₂SO₃ is 158.2558 g/mol. In the K₂SO₃ molecule, there are two potassium atoms, one sulfur atom, and three oxygen atoms.

2. Properties: K₂SO₃

2.1 Physical properties of K₂SO₃: K₂SO₃ forms white crystals, is odorless, and has a neutral or slightly alkaline pH.

2.2 Chemical properties of K₂SO₃: K₂SO₃ is a weak salt, easily oxidized in the air to form potassium sulfate. K₂SO₃ is capable of reacting with a strong acid to form sulfur dioxide gas.

3. Common chemical equations of K₂SO₃:

• Reaction with acid: K₂SO₃ + 2HCl -> 2KCl + H₂O + SO₂
• Reaction with atmospheric oxygen: 2K₂SO₃ + O₂ -> 2K₂SO₄

4. Synthesis of K₂SO₃

4.1 Laboratory synthesis of K₂SO₃: There is no information on the synthesis of K₂SO₃ in the laboratory.

4.2 Industrial synthesis of K₂SO₃: In industry, K₂SO₃ is commonly produced through the reaction between potassium hydroxide and sulfur dioxide.