Strong oxidizing properties of concentrated sulfuric acid (1) reacts with the metal ① concentrated sulfuric acid at room temperature to make iron, aluminum and other metal passivation. ② When heating production of sulfuric acid, concentrated sulfuric acid can all metals except gold reaction, platinum, generating high metal sulfate itself is generally reduced to sulfur dioxide. Cu + 2H2SO4 (conc.) ==== CuSO4 + SO2 ↑ + 2H2O2Fe + 6H2SO4 (conc.) ==== Fe2 (SO4) 3 + 3SO2 ↑ + 6H2O In the above reaction, sulfuric acid showed a strong oxidizing and acidic. (2) non-metallic reaction heat of concentrated sulfuric acid can be carbon, sulfur, phosphorus and other non-metallic elemental to its high oxidation state of oxide or oxygen-containing acid, itself being reduced to sulfur dioxide. In this type of reaction, concentrated sulfuric acid showed only oxidation. C + 2H2SO4 (conc) == CO2 ↑ + 2SO2 ↑ + 2H2OS + H2SO4 (conc.) ==== 3SO2 ↑ + 2H2O2P + 5H2SO4 (conc.) ==== 2H3PO4 + 5SO2 ↑ + 2H2O (3) and other reducing reacting concentrated sulfuric acid with strong oxidizing, laboratory preparation of hydrogen sulfide, hydrogen bromide, hydrogen iodide reducing gas can not use concentrated sulfuric acid. H2S + H2SO4 (conc.) == S ↓ + SO2 ↑ + 2H2O2HBr + H2SO4 (conc.) == Br2 ↑ + SO2 ↑ + 2H2O2HI + H2SO4 (conc.) == I2 ↓ + SO2 ↑ + 2H2O Because we are professional so we do better quality of the first faith-based quality assurance at reasonable prices identification method. Concentrated sulfuric acid is greater than the weight sulfuric acid density (98% concentrated sulfuric acid density of 1.84g / mL) of concentrated sulfuric acid manufacturers, so in the same volume, the weight is concentrated sulfuric acid. 2. Viscosity measurement of concentrated sulfuric acid is a viscous liquid, and sulfuric acid is close to the viscosity of water, so shake the reagent bottle to pick up a few times, you can see which is concentrated sulfuric acid, liquid relatively little in a test tube full of desirable oscillation . 3. Boiling point method is a high-boiling sulfuric acid, 98% concentrated sulfuric acid boiling point of 338 ℃, it is preferable to a little heated in a test tube, the first boiling and there is a lot of water vapor produced by dilute sulfuric acid, careful not to inhale the steam, because there will be a small amount of acid liquid with distilled water. Hard boiling is concentrated sulfuric acid. 4. Dilution of concentrated sulfuric acid dissolved in the water emit a lot of heat, you can add 10mL water in a small beaker, slowly add acid along the beaker wall (must not adding water to the acid), emitted when a large amount of heat is dissolved in concentrated sulfuric acid. 5. Almandine method was to take a little test tube, wire or aluminum, no phenomenon is concentrated sulfuric acid, sulfuric acid bubbles are appearing. 6. Copper carbon law were taken two test tubes, after the addition of copper or charcoal, then were added to the acid and then heated, can produce irritating gases are concentrated sulfuric acid. Irritating gases is sulfur dioxide. 7. Vitriol law were taken two test tubes, add a little vitriol, then were added to the acid, the solution becomes blue crystals dissolve is the production of sulfuric acid sulfuric acid factory, the crystal surface becomes white is concentrated sulfuric acid. 8. Cellulose method was used in two with a glass rod dipped in acid on a paper or wood or cloth painting marks a period of time, the surface is blackened carbonization dehydration of concentrated sulfuric acid. 9. France added sugar in a small beaker of about 10g sugar, dropped 1mL water, then adding the acid, can produce sucrose dehydration carbonization "black bread" is concentrated sulfuric acid. The reaction is concentrated sulfuric acid and water utilized to promote the exothermic reaction, water as a catalyst. 10. Concentrated sulfuric acid when exposed is absorbent, open-period of time, increase the quality of concentrated sulfuric acid, sulfuric acid may be due to the quality of water evaporation to reduce the production of sulfuric acid manufacturers _ _ Zhengzhou University Avenue Ronda Ronda chemical by the Zhengzhou Chemical Products Limited. Zhengzhou Longda Chemical Products Co., Ltd. (www.longdahuagong.com/) in the field of inorganic acid poured boundless enthusiasm and passion, Zhengzhou Longda Chemical has been customer-centric, the concept of creating value for customers, quality, service to win the market, and sincerely hope to cooperate with the community to create success, to create brilliant. Related businesses welcomed the inquiry, Contact: Manager Xu.