Ammonia-ammonium chloride buffer solution is widely used in analytical chemistry to maintain a stable pH environment during various chemical reactions and processes. It is particularly effective in pH ranges around 9 to 10, making it suitable for applications such as complexometric titrations, where it helps in the accurate determination of metal ions like calcium and magnesium. The buffer is also employed in biochemical research for maintaining pH in enzyme assays and protein studies. In industrial settings, it is used in water treatment processes to control pH levels and prevent corrosion in pipelines. Additionally, it finds application in the preparation of certain dyes and pharmaceuticals, where precise pH control is crucial for optimal product quality.