Spot zinc oxide direct method

Appearance and traits: white powder or hexagonal crystal. Odorless and tasteless, no sand. The heat turns yellow, after cooling again becomes white heated to 1800 ℃ sublimation. Hiding half of titanium dioxide and zinc sulfide. Coloring power is twice the basic lead carbonate. [4] Solubility: soluble in acid, sodium hydroxide, ammonium chloride, insoluble in water, ethanol and ammonia. [5] The chemical nature of the chemical data: NIST chemical information: Zinc oxide (1314-13-2) EPA Chemical Substance Information: Zinc oxide (ZnO) (1314-13-2) Category: Oxide Zinc oxide is a famous white pigment, zinc white common name. The advantage is that the same black encountered H2S gas, because ZnS is white. When heated, ZnO from white, yellow and gradually turns lemon yellow, yellow when it receded after cooling, use of this feature, it incorporated into the paint or join thermometer, made of color paint or discoloration thermometer. ZnO convergence and because there is a certain degree of disinfection in the pharmaceutical often use to prepare a paste, ZnO is also used as a catalyst. [5] chemical reaction: Reaction with NaOH: 2NaOH + ZnO = Na2ZnO2 + H2O NaOH + ZnO + H2O = Na2 [Zn (OH) 4]