The simplest answer is probably - "lye soap". In broader terms, the reaction of fats with bases (like NaOH) is called "saponification" and the product is soap. Saponification involves hydrolysis of triglycerides, which are esters of fatty acids, to form the salt (sodium salt if the base is NaOH) of a carboxylates. In addition to soap, such traditional saponification processes produces glycerol.
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Sodium hydroxide (NaOH) reacts with hydrochloric acid (HCl) to form sodium chloride (NaCl) and water (H2O).
Sodium oxide is soluble in water and will react with water to form sodium hydroxide. The resulting solution will be basic because of the presence of sodium hydroxide.
The precipitate formed when sodium hydroxide reacts with potassium iodide is brown.
Metallic copper does not react with sodium hydroxide. But if sodium hydroxide is added into a solution of copper ions, it would form Copper(II) Hydroxide. It is a precipitate which is insoluble in water.
The reaction between sodium oxide and water produces sodium hydroxide (NaOH). This reaction is exothermic, releasing heat as the sodium oxide reacts with water to form sodium hydroxide.