Sodium Thiosulfate is an inorganic compound which has a chemical formula Na2S2O3. It consists of 2 sodium (Na+) cations and a positively charged thiosulfate ion (S2O3–). Sodium thiosulfate will be prepared by heating sulfur with sodium sulfite solution.
6NaOH + 4S → Na2S2O3 + 2Na2S + 3H2O
The other names of sodium thiosulfate are sodium hyposulfite, hyposulphite of soda.