What Are The Physical Properties Of The Resulting Solution After The Reaction Between Sodium Metabisulfite And Water?

The addition of sodium metabisulfite (Na2S2O5) to water results in the formation of a solution. The resulting solution is slightly acidic and exhibits a sulfur dioxide-like odor due to the release of sulfur dioxide gas upon dissolution of Na2S2O5 in water.

The solution is colorless when pure, but impurities may cause it to appear yellow or brown. It is hygroscopic, meaning it readily absorbs moisture from the air. The solubility of Na2S2O5 in water is approximately 54 g/100 mL at room temperature, and the pH of a saturated solution is around 4.5.

In terms of its chemical properties, the solution undergoes acid-base reactions with bases and acidic oxides. It also reacts with oxidizing agents, releasing sulfur dioxide gas. Additionally, the solution can be used as a reducing agent in certain chemical reactions.