The three alkalis that float on water are Lithium, Sodium and Potassium.
This is because they are much denser that water.
As shown this is the density of each substance.
0.534 - Li
0.968 - Na
0.890 - K
1.000 - Water
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Potassium is an alkali metal that floats on water. When placed on water, potassium reacts vigorously, producing hydrogen gas and forming a solution of potassium hydroxide. This reaction generates enough energy to overcome the gravitational force, causing potassium to float.
The solubility of alkali metals in water is high. Alkali metals such as lithium, sodium, and potassium readily dissolve in water to form alkaline solutions.
Water is neutral, neither acid nor alkali. It has a pH of 7, which is considered neutral on the pH scale.
When an acid neutralizes an alkali, a salt and water are formed. The salt is usually composed of the cation from the alkali and the anion from the acid.
Hydrogen oxide is neither an acid nor an alkali. It is water, which is a neutral substance.
Cork floats in water because it is less dense than water. Its buoyant property allows it to stay afloat on the water's surface.