What happens when metals dissolve in alkalis?

When metals dissolve in alkalis, they typically undergo a chemical reaction that can produce metal hydroxides and hydrogen gas. The reaction occurs as the alkali's hydroxide ions interact with the metal, often leading to the formation of soluble metal hydroxides, especially for alkali-reactive metals like aluminum and zinc. This process can result in the generation of bubbles of hydrogen gas, which may be observed as effervescence. The extent of the reaction depends on the reactivity of the metal and the concentration of the alkali.