dolor (plural dolors) ( 1 literary) Sorrow, grief, misery or anguish. 2  A unit of pain used to theoretically weigh people's outcomes.
Potassium, K. Reaction with water. When a small piece of potassium is added to water, it produces a hissing sound as it burns with a lilac flame. It also moves about quickly on the water surface. [ image ]. Hydrogen gas is given out in the reaction. The resulting alkaline solution will turn red litmus blue because of the potassium hydroxide formed.
Reaction of metals and water (General) A few very reactive metals will react with cold water. Potassium's reaction is the most violent that you are likely to encounter in the science lab. Potassium, sodium, lithium and calcium all react very fast when placed in water. The products of the reaction in each case are a metal hydroxide (froming an alkaline solution) and hydrogen gas. Magnesium requires the water to be in the form of steam for a clearly observable reaction to take place.