Add of distilled water at room temperature to a clean test tube and add a spoonful of sodium thiosulfate pentahydrate . Stopper the test tube and shake . If all the crystals dissolve add one more spoonful and shake again. Using the terms SATURATED or UNSATURATED , describe this solution. Keep this for procedure 10. If you added additional sodium thiosulfate solid to this mixture would you expect it to dissolve ? Explain .