(2) separating NH 4 Cl from K 2 SO 4 to accelerate the chemical reaction rate; Prevent the crystallization of KNO 3 and improve the yield of KNO 3.
(3) adding Ba(NO 3) 2 solution until no precipitate appears, standing, and dropping AgNO 3 solution into the supernatant. If precipitation occurs, it means.
Potassium sulfate and KCl are mixed together.
(4) Kasuo 4, KNO 3