化学沉淀（chemical precipitation）.doc

化学沉淀（chemical precipitation） Third, special material identification (Science) 2012-10-13 First, common chemicals and their solutions and precipitation color. (1) the color of solid 1. Red solid: copper, iron oxide 2, green solid: aerugo 3, Blue Solid: copper hydroxide, copper sulfate crystal 4, dark purple solid: Potassium Permanganate 5, pale yellow solid: sulfur 6 colorless solid: ice, dry ice, diamond 7 、 silver white, solid: silver, iron, magnesium, aluminum, mercury and other metals 8, black solid: iron powder, charcoal, copper oxide, manganese dioxide, iron oxide oxide (carbon black, activated carbon) 9, red brown solid iron 10, the white solid sodium chloride, sodium carbonate, sodium hydroxide, calcium hydroxide, calcium carbonate, calcium oxide, copper sulfate, phosphorus pentoxide, Magnesium Oxide (two) the color of the liquid 11, colorless liquid: water, hydrogen peroxide 12, a blue solution: copper sulfate, copper chloride, copper nitrate solution 13. Light green solution: ferrous sulfate solution, ferrous chloride solution, ferrous nitrate solution 14. Yellow solution: ferric sulfate solution, ferric chloride solution, ferric nitrate solution 15, purple solution: Potassium Permanganate solution 16, purple litmus solution: solution (three) the color of gas 17, reddish brown gas: nitrogen dioxide 18, yellow green gas: chlorine gas 19, colorless gas: oxygen, nitrogen, hydrogen, carbon dioxide, carbon monoxide, sulfur dioxide, hydrogen chloride gas, and most other gases. (four) precipitation color; 20, red brown floc --------Fe (OH) 3 ferric hydroxide 21, light green ------------Fe (OH) 2 ferrous hydroxide precipitation 22, blue floc ----------Cu (OH) 2 copper hydroxide 23, white precipitate --------------CaCO3, BaCO3, AgCl, BaSO4, (BaSO4 and AgCl are insoluble white precipitate of HNO3, CaCO3, BaCO3 is white precipitate dissolved in HNO3), Mg (OH) 2. 24, pale yellow precipitate (in aqueous solution) ----S 25, slightly soluble in water, ------------Ca (OH)