Ammonium Purpurate, commonly known as Murexide, is a purple-red crystalline compound and an ammonium salt of purpuric acid. It is primarily used as a complexometric indicator in analytical chemistry, particularly for the titration of calcium, magnesium, and rare earth metals.

Murexide exhibits vivid color changes depending on the pH and the presence of metal ions:

• In acidic solution: Red-violet
• With calcium or magnesium ions (alkaline solution): Blue or purple

It is moderately soluble in water and practically insoluble in alcohol. Murexide is sensitive to light and should be stored in dark, airtight containers. It is generally stable under dry conditions but can slowly degrade if exposed to moisture or strong acids/bases.

Ammonium sulphate ((NH₄)₂SO₄) is a widely used inorganic salt consisting of ammonium and sulfate ions. It appears as a white crystalline solid (powder, granules, or crystals) and is highly soluble in water.

The 98.5% grade indicates high purity, commonly used in fertilizers, industrial processes, and laboratory applications. It is especially valued as a nitrogen fertilizer, supplying both nitrogen and sulfur essential for plant growth.

Ammonium Thiocyanate, also known as Ammonium Sulphocyanate, is a white crystalline solid that is highly soluble in water and slightly soluble in alcohol. It is commonly used in analytical chemistry, photography, dyeing, and as a laboratory reagent for various chemical reactions.

This compound is hygroscopic and should be stored in airtight containers to prevent moisture absorption. It is thermally stable under normal conditions but can decompose upon strong heating to release toxic gases like ammonia, sulfur oxides, and nitrogen oxides, so careful handling is necessary

Di-Ammonium Citrate (DAC) is a white crystalline or granular inorganic salt derived from citric acid and ammonia. It is highly soluble in water, forming a slightly alkaline solution, and is commonly used in food, pharmaceutical, and chemical industries.

This compound acts as a buffering agent, sequestrant, and pH regulator, and can also serve as a source of ammonium ions in chemical reactions. It is non-toxic and hygroscopic, so proper storage in airtight containers is recommended.

Tri-Ammonium Citrate is a water-soluble ammonium salt of citric acid, commonly used as a buffering agent, complexing agent, and analytical reagent. It is typically supplied as a white crystalline powder or granules with high purity (97–103%), suitable for laboratory, pharmaceutical, and industrial applications.