Experiment on the preparation of copper formate from scrap copper shavings

First, the copper is oxidized into copper oxide, and copper sulfate (copper sulfate of 5 crystalline water is generally produced) is made with sulfuric acid, and then the sodium bicarbonate and copper sulfate are ground together until they are even, and then heated in nearly boiling distilled water for a few minutes while stirring, clarified, and then repeatedly removed the sulfate ions in the easy with barium chloride, and the solution is dried into a solid, and then an appropriate amount of distilled water is added to heat to about 50 °, and formic acid (that is, formic acid) is added drop by drop until the solid is all dissolved.

Copper formate can be obtained by heating and evaporating the solution to about one-third of the volume of the original liquid, cooling to room temperature, washing with ethanol twice or more, and then filtering and drying.

Hope you can, thanks.

First, the copper is oxidized into copper oxide (which can be burned by burning method), and then the copper sulfate is made by reacting with dilute sulfuric acid (copper sulfate of 5 crystalline water), and then the sodium bicarbonate and copper sulfate are ground together until they are uniform, and then they are heated in nearly boiling distilled water for a few minutes while stirring, clarified, and then the sulfate ions in the solution are repeatedly removed with barium chloride, and the solution is dried into a solid, and then an appropriate amount of distilled water is added to heat to about 50 °, and formic acid is added drop by drop until the solid is all dissolved. The solution is then heated and evaporated to about one-third of the volume of the original liquid, and cooled to crystallize at room temperature. Copper formate crystals are obtained by washing with ethanol twice or more, and then filtering and drying.

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1) The direct reaction between copper and nitric acid will produce nitrogen oxides, which not only produces pollution sources, but also reduces the utilization rate of nitric acid; Copper chips are burned in the air to form Cuo, Cuo, and Hno3

There is no nitrogen oxide generation in the reaction, which not only avoids pollution, but also improves the utilization rate of nitric acid.

2) Concentrated nitric acid is volatile, unstable, and seriously corrosive to equipment.

3) Crystallization method (or recrystallization method).

4) Acids. 1) The direct reaction between copper and nitric acid will cause hail to accompany the oxide formation of oak nitrogen, which not only produces pollution, but also reduces the utilization rate of nitric acid; Copper chips are burned in the air to form Cuo, Cuo, and Hno3

There is no nitrogen oxide formation in the reaction, which not only avoids pollution, but also improves the utilization rate of nitric acid. (2) Concentrated nitric acid is volatile, unstable, and seriously corroded to equipment, and dilute nitric acid has low volatility, and the reaction between dilute nitric acid and copper oxide also produces copper nitrate. (3) Since the copper nitrate solution is obtained, the crystals need to be concentrated and crystallized to obtain them.

4) Nitric acid reacts with copper oxide to form copper nitrate and water, and there is no valency change, so it reflects the acidity of nitric acid.

1. Copper can react with oxygen to form copper oxide, and the equation is: 2Cu+O2

2cuo, which belongs to the reaction of multiple variations, chemical reactions;

So the answer is: 2Cu+O2

2cuo；chemical reactions;

2. Copper sulfate reacts with sodium hydroxide to form copper hydroxide and sodium sulfate, the equation is: CuSO4 +2NaOH Cu(OH)2 +Na2 SO4; This reaction is the reaction of two compounds to produce two compounds is a metathesis reaction

So the answer is: CuSO4 +2NaOH Cu(OH)2 +Na2 SO4 ; Metathesis reaction

3. Copper hydroxide will generate copper oxide and water when heated, and the equation is Cu(OH)2

cuo+h2 o；It is a reaction in which a substance generates a variety of substances, which belongs to the decomposition reaction Therefore, the answer is: Cu(OH)2

cuo+h2 o；Decomposition reactions

4. Iron will react with copper sulfate to form ferrous sulfate and copper, which reacts with one element and one compound to form another element and another compound, which conforms to the concept of displacement reaction and belongs to the displacement reaction

So the answer is: fe+cuso4 feso4 +cu; displacement reaction;

C. Test question analysis: A concentrated nitric acid reacts with copper to form polluting gas NO2, so A is wrong; b dilute nitric acid reacts with copper to form polluting gas NO, so B is wrong;

c Copper reacts with oxygen to form cuo, and the reaction with nitric acid consumes the least nitrate collapsing acid, and there is no hail to accompany the oak to generate polluting gas, so c is correct;

d Copper reacts with concentrated sulfuric acid to form sulfur dioxide, a polluting gas near the source, so d is wrong.

Therefore, C. Comments: This question examines the properties of nitric acid, the topic is not difficult, this question pays attention to the properties of common element compounds, and pays attention to the requirements of the question to grasp the atomic economic problems.