Disodium 3-hydroxy-2,7-naphthalenedisulfonate(CAS: 135-51-3)

Disodium 3-hydroxy-2,7-naphthalenedisulfonate, with the CAS number 135-51-3, is a sodium salt of 3-hydroxy-2,7-naphthalenedisulfonic acid. It is a white crystalline solid that is commonly used as a pH indicator and buffer in various chemical and industrial applications. The compound is known for its ability to change color in response to pH changes, making it useful in determining acidity or alkalinity levels.

Disodium 3-hydroxy-2,7-naphthalenedisulfonate is primarily used as a pH indicator, especially in the range of pH 4 to 6, where it exhibits a distinct color change. It also serves as a buffer in pharmaceutical and laboratory settings. Additionally, it is used in the production of dyes, as a component in some cleaning products, and in the formulation of certain food additives for pH control.

Disodium 3-hydroxy-2,7-naphthalenedisulfonate is generally considered safe when handled in accordance with standard chemical safety protocols. However, as with any chemical, it should be used with appropriate protective measures, such as gloves and goggles, to avoid direct contact. It is not classified as highly toxic, but safety data sheets (SDS) should be consulted for detailed handling and disposal instructions.

Disodium 3-hydroxy-2,7-naphthalenedisulfonate should be stored in a cool, dry, and dark place to maintain its stability and effectiveness. It is best kept in a tightly sealed container away from moisture and light exposure. The recommended storage temperature is typically between 15°C and 25°C, and it should be protected from strong acids or bases to prevent degradation.