Sodium thiosulphate pentahydrate is a versatile chemical compound with a variety of applications. It is commonly used as a reagent in analytical chemistry, where it helps to neutralize iodine in redox titrations. In the photographic industry, it functions as a fixing agent to remove unreacted silver halides from photographic films and papers, ensuring image clarity.

Additionally, sodium thiosulphate is utilized in water treatment processes to dechlorinate water by neutralizing chlorine and chloramine. In medicine, it has been explored for its potential use in treating cyanide poisoning and as a possible adjunct in certain cancer therapies. Its extra-pure form ensures high accuracy and effectiveness in these critical applications.