The following drugs, medications, substances or toxins are some of the possible causes of Eyelid pain as a symptom. Always advise your doctor of any medications or treatments you are using, including prescription, over-the-counter, supplements, herbal or alternative treatments. 1  Lumigan.
Some substances dissolve when you mix them with water. When a substance dissolves, it looks like it disappears. But in fact it has just mixed with the water to make a transparent (see-through) liquid called a solution. When you mix sugar with water, the sugar dissolves to make a transparent solution. Salt dissolves in water too. Heat can help some substances dissolve faster in water. Salt, for example, will dissolve quicker in hot water than in cold water. Substances that dissolve in water are called soluble substances.
Dissolving salt. 1  When salt crystals are placed in water, the positive ends of the water molecules attract the negative chloride ions. 2  The negative ends of the water molecules attract the positive sodium ions. 3  When attraction between the water and the ions overcomes the attraction the ions have for each other, the salt dissolves.