Color table of chemical precipitates in junior high school

Reddish-brown flocculent precipitate: Fe(OH)3

Light green precipitate: Fe(OH)2

Blue flocculent precipitate: Cu(OH)2

White precipitate: CaCO3, BaCO3, AGCL, BaSO4, (where BaSO4 and AGCL are white precipitates insoluble in HNO3, CaCO3.)

BaCO3 is a white precipitate dissolved in Hno3), mg(OH)2

The eight major precipitates of junior high school chemistry are:

AGCL (silver chloride), BaSO4 (barium sulfate), CaCO3 (calcium carbonate), BaCO3 (barium carbonate), Al(OH)3 (aluminum hydroxide), MG(OH)2 (magnesium hydroxide), Cu(OH)2 (copper hydroxide), Fe(OH)3 (iron hydroxide).

Silver chloride and barium sulfate are insoluble in acids, and the other six major precipitates are soluble in acids.

Among them, AgCl, BaSO4, CaCO3, BaCO3, Al(OH)3 and Mg(OH)2 are white precipitates, Cu(OH)2 are blue flocculent precipitates, and Fe(OH)3 are reddish-brown precipitates. Silver chloride and barium sulfate are insoluble in acids, calcium carbonate and barium carbonate are soluble in acids and have bubbles, magnesium hydroxide, aluminum hydroxide, iron hydroxide and copper hydroxide are soluble in acids without bubbles.

Precipitation is typically found in metathesis reactions, where copper hydroxide is typically formed by the reaction of copper sulfate and sodium hydroxide.

1. Red solid: copper, iron oxide;

2. Green solid: basic copper carbonate;

3. Blue solid: copper hydroxide, copper sulfate crystals;

4. Purple-black solid: potassium permanganate;

5. Light yellow solid: sulfur;

6. Colorless solids: ice, dry ice, diamond;

7. Silvery-white solid: silver, iron, magnesium, aluminum, mercury and other metals;

8. Black solid: iron powder, charcoal, copper oxide, manganese dioxide, ferric tetroxide, (carbon black, activated carbon);

9. Reddish-brown solid: iron hydroxide;

10. White solid: sodium chloride, sodium carbonate, sodium hydroxide, calcium hydroxide, calcium carbonate, calcium oxide, copper sulfate, phosphorus pentoxide, magnesium oxide.

1: Solid.

or crystals).

mg,fe,zn,ag silvery-white.

P (white), P2O5, CAO, MGO, KCLO3, CuSO4, NaCl white.

C, Cuo, Mno2, Fe3O4 Black.

Cu, P (red), Fe2O3 red.

Spot color KMNO4 violet.

Black cuso4

Copper hydroxide (blue) Cuoh copper carbonate copy (blue) CuSO4 barium sulfate (white) baso4 barium carbonate (white) baCO3 calcium carbonate (white) CaCO3

Magnesium hydroxide (white) mg(OH)2

Aluminium hydroxide (white) Al(OH) 3

Manganese carbonate (white), mnCO3, manganese dioxide (black), mno2, zinc hydroxide (white), ZN(OH)2, zinc carbonate (white), ZNCo3, iron hydroxide (reddish-brown), Fe(OH)3, ferrous hydroxide (green), Fe (OH)2, silver chloride (white), AGCL, silver carbonate (white), Ag2CO3

Silver chloride white, potassium permanganate purple, copper oxide black, iron hydroxide reddish-brown, sulfate shell white, copper hydroxide blue, iron chloride brown, sodium peroxide yellow, sulfur element light yellow.

Copper carbonate is blue-green, other carbonates are white.

Iron hydroxide is reddish-brown, copper hydroxide is blue, ferrous hydroxide, magnesium hydroxide, aluminum hydroxide is white barium sulfate, and silver nitrate is white (insoluble in acid).

Iron salt solution yellow.

The ferrous salt solution is light green.

Copper salt solution blue.

These are junior high school ones.

Copper hydroxide: blue iron hydroxide: reddish-brown ferrous hydroxide: white flocculent precipitation, quickly turning gray-green in the air.

genus, which eventually became reddish-brown barium sulfate, silver chloride, calcium carbonate, barium carbonate, silver carbonate, silver sulfate, aluminum hydroxide: white silver iodide: yellow, silver bromide:

Light yellow Sulphur: Yellow , Potassium permanganate: Purple Copper oxide:

Black silver hydroxide: white, quickly decomposes into silver oxide when exposed to water, black precipitate solution color: iron ions:

Yellow ferrous ions: light green copper ions: blue chromogenic reactions:

Ferrric ions and phenol: purple concentrated nitric acid and protein: yellow iodine meets starch:

In addition, blue: flame color: potassium:

Purple Sodium: Yellow Copper: Green Calcium:

Brick-red copper hydroxide and polyhydroxyl alcohol (glucose): reddish blue.

Precipitation: reddish-brown flocculent precipitate---Fe(OH)3 light green precipitate---Fe(OH)2 blue flocculent precipitate---Cu(OH)2 white precipitate---CaCO3,BaCO3,AGCL,BaSO4,(where BaSO4, AGCl are white precipitates insoluble in HNO3, CaCO3 BaCO3 is a white precipitate dissolved in HNO3), mg(OH)2Light yellow precipitate (in aqueous solution)--S slightly soluble in water---Ca(OH)2,CaSO4

2. Color and state of common substances 1. White solids: MGO, P2O5, CaO, NaOH, Ca(OH)2, KCLO3, KCl, Na2CO3, NaCl, anhydrous CuSO4; Iron and magnesium are silvery-white (mercury is silvery-white liquid) 2. Black solid: graphite, carbon powder, iron powder, Cuo, mNO2, Fe3O4 KMNO4 is purple-black 3, red solid:

Cu, Fe2O3, Hgo, red phosphorus Sulfur: light yellow Cu2(OH)2CO3 is green 4, the color of the solution: all solutions containing Cu2+ are blue; All solutions containing Fe2+ are light green; Where the solution containing Fe3+ is brownish-yellow, the rest of the solution is generally not colorless.

Potassium permanganate solution is purplish red) 5. Precipitation (i.e., salts and alkalis insoluble in water): Salt: white:

CaCO3, BaCO3 (soluble in acid) AGCL, Baso4 (also insoluble in dilute Hno3) and other alkalis: blue: Cu(OH)2 reddish-brown :

Fe(OH)3 white: the rest of the base.

mg(oh)2 (white precipitate) copy iron: iron powder attack is black; A single piece of solid iron is silvery-white. Fe2+ – light green Fe3O4 – black crystals.

Fe(OH)2 - white precipitate Fe3+ - yellow Fe (OH)3 - reddish-brown precipitate Fe (SCN)3 - blood red solution.

Feo – black powder Fe (NH4)2(SO4)2 – light blue-green Fe2O3 – reddish-brown powder Fes – black solid.

Copper: The elemental is purple-red Cu2+ - blue Cuo - black Cu2O - red Cuso4 (anhydrous) - white Cuso4