Sodium thiosulfate pentahydrate is a white, crystalline solid. The melting point is 884degC. It is very soluble in water, and is insoluble in ethanol. It can be used to manufacture synthetic detergents and soaps, and as a laboratory reagent.
Medical Uses of Sodium Thiosulfate
It has been used as a cyanide poisoning antidote and a nephroprotective agent in treatment of cisplatin toxicity. It also has a role as an anti-inflammatory agent in medicine and in treating skin conditions such as dermatophytosis (ringworm) and tinea versicolor.
The melting point of sodium thiosulfate pentahydrate can be measured using a temperature sensor and a flame. To do this, pour 20 grams of the substance in a glass container and fix it on a laboratory stand, so that the bottom of the container is 15 – 20 cm far from the burner.
Place the temperature sensor in this container, so that its measuring element stays immersed in the substance even after it has melted. Set the temperature sensor to a programme for data collection, and ignite the burner while setting the measurement time for at least 25 minutes.
After the temperature of the sodium thiosulfate pentahydrate has exceeded 60 degC, stop the measurement and dispose of the substance. It can be discarded by pouring it into the drain.
