SOLUTION AND SOLUBILITY When some salt is added to water and stirred, the salt disappears. This is because the salt has dissolved in the water. Dissolving is a change where substances mix completely with the liquid they have been added to. Not all substances dissolve in water. Only some substances like salt and sugar, dissolve in water and are known as soluble substances. … [Read more...] about What Is A Solution And How Does It Relate To Solubility