| Sodium sulphate, therefore, forms only one stable hydrate, the decahydrate. |
| Add sodium tetraborate decahydrate to one liter of warm distilled water until saturation is reached then cool to room temperature. |
| It most commonly occurs as a crystalline decahydrate, which readily effloresces to form a white powder, the monohydrate. |
| The solution is then cooled to recrystallize nearly pure sodium carbonate decahydrate. |
| Two of these solutions, however, would be metastable and supersaturated with respect to the decahydrate. |
| This temperature, therefore, is the transition temperature for decahydrate and anhydrous salt. |
