Miss Cellania, it is not the mixture of Sodium (Na) with Alkali, because Sodium is an Alkali Metal (which is basically all of the Elements on the most left side of the table; Sodium, Cesium, etc.), it is the mixture of Sodium with water (H20).
2 Na + 2 H2O ---> 2 NaOH + H2. Which is basically, 2 moles of Na and 2 moles of H20, yields Sodium Hydroxide (Lye) and Hydrogen Gas.