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Anonymous users2024-02-06CaCO3, BaCO3, Baso4, Baso3, Fe(OH)2 (unstable), Agoh (unstable), Mg(OH)2, Al(OH)3, Zn(OH)2, H4SiO4 (H2SiO3), Zns, NaHCO3 (precipitate produced by CO2 in saturated Na2CO3), CaSO4 (slightly soluble).
The high school basically white precipitate is only the above-mentioned kind. If you have any other words, please help the comrades downstairs work hard to help the landlord find out, thank you!!
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Anonymous users2024-02-05Reddish-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)2
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Anonymous users2024-02-04Magnesium hydroxide. Calcium carbonate.
Silver chloride Barium sulfate.
Barium carbonate is mainly these five colorless.
Copper hydroxide is blue.
Iron hydroxide is reddish-brown in color.
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Anonymous users2024-02-03chemical experiments] common precipitation formation.
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Anonymous users2024-02-02The color of the common chemical substance.
a) The color of the solid.
1. Black solid (5 kinds): charcoal, copper oxide, manganese dioxide, ferric tetroxide.
Iron powder. 2. Red solid: copper - purple red, iron oxide Fe2O3 - red (brown) color.
3. Blue crystal: copper sulfate crystal.
cuso4•5h2o
4. Blue precipitation: copper hydroxide.
5. Reddish-brown precipitate: iron hydroxide.
6. White precipitate (6 types): calcium carbonate.
barium carbonate, silver carbonate; Magnesium hydroxide.
Barium sulfate, silver chloride.
7. White solid: anhydrous copper sulfate.
Calcium oxide, magnesium oxide, potassium chlorate, potassium chloride.
8. Green solid: basic copper carbonate.
9. Purple-black solid: potassium permanganate.
The reaction to produce a white precipitate is:
ca(hco3)2δ
caco3↓+h2o+co2↑
white precipitation, produced to make clear lime water.
Turbid gas.
Limescale formation. Stalactite.
of the formation. hcl+agno3=
agcl↓+hno3
Produces a white precipitate, insoluble in dilute nitric acid.
Check the principle of cl-.
ba(oh)2+
h2so4=baso4↓+2h2o
Produces a white precipitate, insoluble in dilute nitric acid.
Examine the principle of SO42.
bacl2+
h2so4=baso4↓+2hcl
Produces a white precipitate, insoluble in dilute nitric acid.
Examine the principle of SO42.
Ba(NO3)2+H2SO4=BASO4 +2HNO3 generates a white precipitate, insoluble in dilute nitric acid.
Examine the principle of SO42.
AlCl3+3NaOH = Al(OH)3 +3NaCl has a white precipitate.
mgcl2+2naoh
mg(oh)2↓+2nacl
There is a white precipitate generated.
cao+h2o
ca(oh)2
The white lumpy solid turns into powder
Quicklime prepares lime slurry.
ca(oh)2+so2=caso3↓+
H2O has a white precipitate generated.
Not in junior high school.
Ca(OH)2+Na2CO3=CaCO3 +2NaOH has a white precipitate to form.
Industrial caustic soda, laboratory caustic soda in small quantities.
Ba(OH)2+Na2CO3=BaCO3 +2NaOH has a white precipitate generated.
ca(oh)2+k2co3=caco3↓
2koh has a white precipitate generated.
agno3+nacl
agcl↓+nano3
A white precipitate that does not dissolve in dilute nitric acid (similar to other chlorides) is used to test chloride ions in a solution.
These will be commonly used in junior high school chemistry, I hope it will be helpful to you.
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Anonymous users2024-02-01The white precipitation in junior high chemistry includes barium sulfate precipitation, calcium sulfate precipitation, white silver oxide precipitation, calcium carbonate precipitation, calcium bicarbonate precipitation, and lead sulfate white precipitation produced by the reaction of barium carbonate and lead sulfate.
1. Barium sulfate precipitation.
When barium sulfate (BaSO4) reacts with choline or when sulfuric acid is added to a barium carbonate (BaCO3) solution, a white precipitate is formed.
2. Calcium sulfate precipitation.
The addition of sodium sulfate (Na2SO4) to the calcium salt solution will produce a white precipitate of calcium sulfate (CaSO4).
3. White silver oxide precipitation.
When silver chloride (AGCL) reacts with ammonium hydroxide (NH4OH) or other aqueous ammonia solutions, a white precipitate is formed.
4. Calcium carbonate precipitation.
The addition of carbonic acid or sodium bicarbonate (NaHCO3) to a calcium salt solution will produce a white precipitate of calcium carbonate (CaCO3). Reflux.
5. Calcium bicarbonate precipitation.
When sodium bicarbonate (NaHCO3) or carbon dioxide (CO2) is introduced into a calcium salt solution, a white precipitate of calcium bicarbonate (Ca(HCO3)2) is formed.
6. The white precipitate of lead sulfate produced by the reaction of barium carbonate and lead sulfate.
When barium carbonate (BACo3) and lead sulfate (PBSO4) solutions react, a white lead sulfate precipitate is produced.
Uses of Chemistry in Junior High School:
1. Cultivate scientific literacy.
The teaching of junior high school chemistry aims to cultivate students' scientific literacy and scientific thinking ability, and enable students to master scientific methods and ways of thinking, and cultivate their observation, experiment, reasoning and problem-solving skills by learning the basic theories and experimental operations of chemistry.
2. Learn basic knowledge.
Junior high school chemistry provides students with a series of basic chemistry knowledge, including the periodic table, reaction equations, chemical bonds, chemical reactions, acid-base neutralization and other basic concepts. This knowledge is the foundation for students to further their studies in advanced chemistry as well as other areas of science.
3. Understand the phenomena of life.
Chemistry is a science that studies matter, and through the study of chemistry in junior high school, students can understand and explain many chemical phenomena in daily life, such as dissolution, corrosion, fermentation, etc., and can use chemical knowledge to solve practical problems, such as water purification, acid-base neutralization, etc.
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Anonymous users2024-01-311. The most common white precipitate in junior high school (6 kinds): calcium carbonate, barium carbonate, silver carbonate; Magnesium hydroxide. Barium sulfate, silver chloride.
2. The common ones that can react to generate white precipitate are:
AlCl3+3NaOH = Al(OH)3 +3NaCl has a white precipitate.
MgCl2+2NaOH=Mg(OH)2 +2NaCl was formed with white precipitate; This inspection.
CaO+H2O=Ca(OH)2 white bulk solid was transformed into powdered tomato and quicklime to prepare anti-wheel lime slurry;
Ca(OH)2+Na2CO3=CaCO3 +2NaOH has white precipitate to produce industrial caustic soda and a small amount of laboratory-made caustic soda;
Ba(OH)2+Na2CO3=BaCO3 +2NaOH has a white precipitate generated.
Ca(OH)2+K2CO3=CaCO3 +2koH has a white precipitate to form.
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Anonymous users2024-01-30Chemical-Silly bright dissolution of common substances is resistant to springing.
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Anonymous users2024-01-291. The most common white precipitate in junior high school (6 kinds): calcium carbonate, barium carbonate, silver carbonate; magnesium hydroxide; Barium sulfate, silver chloride.
2. The common ones that can react to generate white precipitate are:
AlCl3+3NaOH = Al(OH)3 +3NaCl has a white precipitate.
MgCl2+2NaOH=Mg(OH)2 +2NaCl was formed with white precipitate;
CaO+H2O=Ca(OH)2 white bulk solid becomes powder, quicklime to prepare lime slurry;
Ca(OH)2+Na2CO3=CaCO3 +2NaOH has white precipitates to generate industrial Zen simple caustic soda, laboratory caustic soda with less suffocation;
Ba(OH)2+Na2CO3=BaCO3 +2NaOH has a white precipitate generated.
Ca(OH)2+K2CO3=CaCO3 +2koH has a white precipitate to form.
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Anonymous users2024-01-28Red smile brown flocculent precipitation: touch and bury 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 liquid socks HNO3), mg(OH)2
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Anonymous users2024-01-27Common acids: HCl, H2SO4, HNO3
Common bases: NaOH, Ba(OH)2, Cu(OH)2 (early blue dust finch flocculent precipitation), Mg(OH)2 (white precipitation).
Common white precipitates: CaCO3, Mg(OH)2, MgCO3; The substances that are white precipitated and insoluble in dilute nitric acid or acid are: BaSO4, AGCL (these two rotten early species).
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Anonymous users2024-01-26Junior high school textbooks are all solid matter colors
Six black solids, six red solids, and seven special colors
Carbon C source refers to red phosphorus p dark red basic copper carbonate Cu2(OH)2CO3 green.
Ferric Oxide Fe3O4 Mercury Oxide Hgo Red Copper Sulfate Pentahydrate CuSO4·5H2O Blue.
Manganese Dioxide MnO2 Ferric Oxide Fe2O3 Red Brown Solid Grip Split Oxygen O2 Light Blue.
Copper oxide cuo copper cu purple red sulfur s yellow.
Iron powder Fe (nano scale) Rust Fe2O3·XH2O reddish-brown Potassium permanganate KMNO4 Dark violet.
ferrous oxide feo ferric hydroxide fe(oh)3 reddish-brown potassium manganate k2mno4 dark green.
Note:
Calcium phosphate Ca3(PO4)2 grayish-white.
All other metals are silvery-white, and all other non-metals are white.
Ion color and corresponding precipitation
Cu2+ Cu Blue Cu(OH)2 Blue.
Fe2+ ferrous ions, light green, Fe(OH)2, white.
Fe3+ iron ion yellow Fe(OH)3 reddish-brown.
KMNO4- permanganate ion purple-red without precipitation.
Note:
All other precipitates are white.
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Anonymous users2024-01-25White precipitates CaCO3, AG(OH)2BaCO3, etc.
Reddish-brown precipitates Fe(OH)3
Blue flocculent precipitate: Cu(OH)2
Copper and eggplant are generally red.
Silvery white trembling fingers.
Copper oxide in black.
A is not true. First of all, the temperature has an effect on the solubility, such as the 30 degrees of potassium nitrate saturated solution to 40 degrees, it is no longer a saturated solution, and then add a little potassium nitrate, less than the saturated state, but its concentration is already larger than the concentration of the saturated solution at 30 degrees, in addition, the solubility of some substances is reduced with the rise of temperature. Such as some gases. >>>More
It's simple, it's about interest, like I dare to sleep, chat and play with my phone in chemistry class in my third year of junior high school, but chemistry is still okay, it's just about interest. >>>More
First, the substance is dissolved in water or a solvent of any kind. >>>More
The relative atomic mass of element M is a, the formula of compound RM2 is b, and the relative atomic weight of r is (b—2a). >>>More
It's all very simple things, as long as you are willing to remember, don't look at the simple but this stage is very critical, directly related to your high school chemistry, so you have to study hard, I am now a sophomore in high school, junior high school chemistry is very good, and now it is infinitely easy.