What solution can turn silver into copper

Theoretically, the silver nitrate solution and copper have a displacement reaction, but after the copper adsorbs a large amount of silver during the reaction process, the reaction rate slows down, and the reaction may not be complete for several months. What's more, the ** of silver nitrate reagent is about the same as that of silver, the cost is too high, and it is best not to consider this scheme.

A low-cost solution is provided for reference.

The silver and copper alloys are acidified with nitric acid to make silver nitrate and copper nitrate solutions. Positive monovalent silver ions play a redox role in boiling ferrous sulfate to form gray metallic silver precipitate, and filter the precipitation to obtain metallic silver with higher purity. The reaction formula for the redox of silver nitrate in a boiled ferrous sulfate solution is as follows:

3agNO3 + 3FeSO4 = Heating = Fe2(SO4)3 + Fe(NO3)3 + 3AG

2agno3 + 2naoh = 2nano3 + h2o + ag2o

ag2o + nahsno2 + naoh = na2sno3 + h2o + 2ag↓

You're probably asking about the solubility of the solution, right? Copper has a stronger order of metallic activity than silver. There is a displacement reaction: Cu+2AGnO3=2AG+Cu(NO3)2

In junior chemistry, copper cannot react with silver chloride. The displacement reaction must be carried out in solution. Because silver chloride is insoluble in water, copper cannot displace silver in silver chloride.

The active type of copper is ranked after H and is considered an inactive metal, so it cannot be reacted to reduce silver.

Hydrogen peroxide has strong oxidizing properties, which can oxidize copper and silver elements into metal cations to obtain copper sulfate solution and silver sulfate (slightly soluble) precipitation.

Because silver chloride is an insoluble substance, the contact surface is too small for the copper powder to displace the silver in silver chloride.

If you want to replace copper with silver, you can use silver nitrate solution

2agno3+cu=cu(no3)2+2ag

The essence of the replacement reaction between copper and silver salt is as follows: Cu + 2AG+ = 2AG + Cu2+ that is, the redox effect of elemental copper and silver ions in the solution occurs, and the qualitative explanation of this in secondary chemistry is: because the solubility of silver chloride in aqueous solution is very small, most of it is precipitated, so it is difficult to carry out the displacement reaction; In fact, from the perspective of electrochemical electrode potential, because the solubility product of silver chloride is too small, the concentration of effective ions completely ionized by the dissolved part is not enough to promote the reaction, so generally only soluble silver salts (such as silver nitrate, etc.) are easy to replace with elemental copper.

There are two reasons: 1. Silver chloride is a solid precipitate and insoluble in water, so it can no longer react with copper. 2. The metallicity of copper is more active than that of silver, and it can no longer react with silver chloride solids.

According to the table of metal activity sequence, copper can react with silver ions, but because silver chloride is insoluble in water, there are no silver ions in the solution, so copper and silver chloride do not react in water, but in the molten state, they can react because there are free movement of silver ions.

Copper and silver chloride solutions can react, very slowly.

Junior silver chloride does not react with copper.

Silver chloride is a precipitate, he does not react with copper.

Verification can be performed with a saline solution.

Methods for verifying the order of metal activity:

1. Judge the strength of metal activity according to the difficulty and intensity of the reaction between metal and oxygen 2. Judge the activity of metal according to whether the metal can react with hydrochloric acid or dilute sulfuric acid and the intensity of the reaction;

Magnesium, zinc, iron, and copper of the same shape and size were added to the test tube, and the same concentration of hydrochloric acid or dilute sulfuric acid was added to the test tube) (control variables: the same contact area, the same type and concentration of acid).

3. The strength of metal activity can be judged according to whether the metal can replace another metal from the solution of metal compounds (salts).

Copper sulphate (blue) solution.

Silver and iron are added to the copper sulfate solution, respectively.

When silver is added, there is no phenomenon, indicating that silver does not react with copper sulfate and cannot replace copper, indicating that the activity of silver is weaker than copper.

When iron is added, the blue color fades, indicating that copper is displaced by iron, producing copper and iron sulfate, indicating that iron is more active than copper.

That is, active: silver, copper, iron.

Method 1: Copper sulfate solution. Silver and iron are added to the copper sulfate solution, and the silver does not react with copper sulfate, indicating that the activity of silver is weaker than that of copper, and the iron can replace the copper element, indicating that the activity of iron is stronger than that of copper

Iron, Copper, Silver. Method 2: ferric nitrate solution, silver nitrate solution.

Put copper element into silver nitrate solution to replace silver element, indicating that copper activity is stronger than silver, and copper element does not react when added to ferric nitrate, indicating that copper activity is weaker than iron. So, active: iron "copper" silver.

Silver nitrate solution, put copper into silver nitrate easily, can replace silver, that is, copper is more active than silver metal.

Sulfuric acid can, first put silver, no chemical change, add copper, copper becomes copper sulfate, and then add iron, iron will replace copper.

Sulfuric acid cover friend copper solution collapse liquid Ah, put silver and iron into copper sulfate solution, iron can be replaced with copper, and silver can not indicate that active iron is stronger than copper and stronger than silver.

Silver ammonia solution can melt silver chloride, the reason is that NH3 in silver ammonia solution reacts with AGCL, that is, AGCL + 2NH3 - H3N-AG-NH3]++Cl, this product is much more stable than silver chloride (decomposes when it sees light), but it is placed for a longer time, and it will generate ** strong silver nitride.

Easy**.

After long-term contact between acetylene and pure copper, silver and mercury and other metals, the most sensitive compounds such as acetylene copper, acetylene silver and other substances will occur, and when they are subjected to severe vibration or the temperature reaches 110-120 degrees, they can **.

Therefore, no tool for acetylene can be made of an alloy of silver and copper with a copper content of more than 70%.

Properties of acetylene.

Pure acetylene is a colorless, odorless gas, boiling point, acetylene made of calcium carbide in industry due to a small amount of hydrogen sulfide, phosphine and other gases, so it has an unpleasant odor. Acetylene is not easily soluble in water, but easily soluble in acetone (1 volume of acetone dissolves 12 volumes of acetylene at 300 atmospheres).

Acetylene is easy to ** under high pressure, and liquid acetylene can be shocked even slightly**. In order to safely store and transport acetylene, the acetone solution of acetylene is generally pressed into a cylinder containing porous substances saturated with acetone (such as diatomaceous earth, asbestos, wood chips) at a pressure of 10 12 atmospheres.

Acetylene, like ethylene, is also capable of addition, oxidation, and polymerization due to the presence of three bonds in the molecule.