When lead reacts with sodium hydroxide, it undergoes a chemical reaction to form lead hydroxide and sodium plumbite. The chemical equation for this reaction is:

Pb + 2NaOH → Pb(OH)2 + Na2PbO2

In this reaction, lead (Pb) reacts with sodium hydroxide (NaOH) to produce lead hydroxide [Pb(OH)2] and sodium plumbite (Na2PbO2). Lead hydroxide is a white, insoluble solid, while sodium plumbite is a yellow-orange, water-soluble compound.