Neither barium hydroxide nor calcium hydroxide can distinguish between Na2CO3 and Na2CO3 Why?

You want to ask why these 2 can't distinguish between sodium carbonate and sodium bicarbonate.

First of all, both strong bases can ionize divalent cations, barium ions, and calcium ions, both of which can combine with carbonate to form precipitates.

Therefore, the phenomenon of sodium carbonate is white precipitate.

Secondly, bicarbonate does not directly react with barium ions and calcium ions, but combines with hydroxide, and the result of the combination is the production of carbonate, which then also produces white precipitate.

So it is impossible to distinguish because the phenomenon is the same.

The general way to distinguish is to use barium ions directly with calcium ions, which refers to salts such as calcium chloride.

Because the precipitate generated by the reaction is BaCO3 and CaCO3 white precipitate, but there are many substances that form white precipitate with Ba2+ and Ca2+, such as sulfate, Baso4 and Caso4 are white precipitates, and PO43- to form barium phosphate and calcium phosphate are white precipitates.

Therefore, when testing CO32-, it is necessary to distinguish whether it may be SO32-1Dilute nitric acid, and then test for carbon dioxide production with barium or calcium ions.

2.Hydrochloric acid can be added first, and the gas produced passes into the magenta solution, if it does not fade, it is passed into the clear lime water, if it becomes turbid, then add calcium chloride solution to the original solution, and if there is a white precipitate, it can be proved that there are carbonate ions in the solution.

3.Barium chloride is added first to produce a white precipitate, and then hydrochloric acid is added to produce a colorless and odorless gas that can make the clarified lime water turbid, which can be proved to be carbonate.

In the method of physical dissolution, sodium hydroxide has a greater solubility in water. The main principle of chemical method distinction is the difference between calcium ions and sodium ions, calcium ions can form white precipitates with carbonate ions. To the two different solutions that have been prepared, the same amount of potassium carbonate solution is added, and the calcium hydroxide solution is generated by white precipitate.

Sodium hydroxide, an inorganic compound, chemical formula NaOH, also known as caustic soda, caustic soda, solid soda, caustic soda, caustic soda. Sodium hydroxide has strong alkalinity and strong corrosiveness, and can be used as acid neutralizing agent, masking agent, precipitating agent, precipitation masking agent, chromogenic agent, saponifying agent, peeling agent, washing and rolling balance manuscript agent, etc., which is very widely used.

There are two methods for industrial production of sodium hydroxide: causticizing and electrolysis. The causticizing method is divided into soda ash causticizing method and trona causticizing method according to different raw materials; The electrolysis method can be divided into the separator electrolysis method and the ion exchange membrane method.

Calcium hydroxide is an inorganic compound with the chemical formula Ca(OH)2, commonly known as hydrated lime or slaked lime. It is a white powdery solid, after adding water, it is divided into two layers, the upper layer of aqueous solution Daxiao is called clarified lime water, and the lower layer of suspension is called lime milk or lime slurry. The upper layer of liquid clarified lime water can be used to test carbon dioxide, and the lower layer of turbid liquid lime milk is a building material.

Calcium hydroxide is a strong alkali, which has the ability to kill bacteria and antiseptic, and has a corrosive effect on ** and fabrics. Calcium hydroxide has a wide range of applications in industry. It is commonly used as a building material, and is also used as a fungicide and chemical raw material, etc.

1 Soluble in water, soluble is sodium hydroxide, slightly soluble (solution turbid) is calcium hydroxide 2 Take a small amount of coarse dissolution in water, inject sodium carbonate solution spring lead, and produce white precipitate is calcium hydroxide Ca(OH)2 Na2CO3 CaCO3 2NaOH

3 Exposed to air that is prone to deliquescent is sodium hydroxide 4 flame color reaction, yellow is sodium hydroxide, brick red is calcium hydroxide

Solution: Ba(OH)2+2HCl==BACL2+2H2OBA(OH)2+H2SO4==BASO4 +2H2OBA(OH)2 reacts with HCl, but can produce white Shenhong cherry lake when it reacts with H2SO4, so it can be identified.

BaCl2 does not react with HCl, and forms a white precipitate of BaSO4 with H2SO4, so it is H2SO4 that can react to form a silver precipitate of white lead, so it can also be identified.

Do you understand? )

Because the reaction of carbon dioxide and sodium hydroxide will produce sodium carbonate and water, sodium carbonate is soluble, so there is no phenomenon;

The reaction of carbon dioxide and calcium hydroxide will produce calcium carbonate and water, and calcium carbonate is insoluble, so white precipitates will be found.

The equation is: CO2 + 2NaOH = NaCO3 + H2O CO2 + Ca(OH)2=CaCO3 (precipitation symbol) + H2O

Because sodium hydroxide can react with carbon dioxide, the sodium carbonate produced is soluble in both water and acid, so it does not precipitate.

Calcium hydroxide reacts with carbon dioxide to form calcium carbonate precipitates (calcium carbonate is insoluble in water and soluble in acid).

Solution: BA(OH)2+2HCl==BACL2+2H2OBA(OH)2+H2SO4==BASO4 +2H2O BA(OH)2 reacts with HCl, and when it reacts with H2SO4, it can generate white precipitate, so it can be identified that BACL2 does not react with HCl, and forms white precipitate BaSO4 with H2SO4, so it is H2SO4 that can react to form white Shenyuan Lake. So it can also be buried in the identification (can you understand?) )

The same, both are ionic bonds.

Ionic bonds are formed after two or more atoms or chemical groups lose or gain electrons and become coarse after the ion excitation hall. There is electrostatic action between oppositely charged ions, when two oppositely charged ions are close to each other, they are attracted to each other, and there is electrostatic repulsion between electrons and electrons, nuclei and nuclei, and when electrostatic attraction and electrostatic repulsion reach equilibrium, ionic bonds are formed. Therefore, an ionic bond refers to a chemical bond formed by electrostatic interaction between anions, cations.

Ionic bonds are chemical bonds, most salts, bonds formed by alkali metals or alkaline earth metals, and active metal oxides have ionic bonds. Compounds that contain ionic bonds are called ionic compounds. Ionic bonds are related to the melting boiling point and hardness of an object.

Ionic bonds, also known as salt bonds, are a type of chemical bonds that form bright towns after two or more volt atoms or chemical groups lose or gain electrons and become ions. There is an electrostatic force of attraction between oppositely charged atoms or groups, and when two oppositely charged atoms or groups are brought close, the surrounding water molecules are released as a static force of attraction created between negatively charged and positively charged atoms or groups in free water to form ionic bonds.

These chemical bonds tend to form between metals and non-metals. It is often the atoms of the metallic element that lose electrons, and the atoms of the non-metallic element that gain electrons. Oppositely charged ions are attracted to each other by electromagnetic force, thus forming chemical bonds.

The ionic bond is stronger than the hydrogen bond, and its strength is close to that of the covalent bond.

Bond-forming particles: anions and cations;

The essence of the bond: the electrostatic interaction between the anion and the cation;

Influencing factors: the size of the radius of the anion and cation, the larger the radius, the smaller the ionic bond; the amount of anion charge ;

Electronic: The formula that denotes the outermost electron of an atom with "· or " " around the element symbol.

Quality. The ionic bond has a strong force, no saturation, and no directionality.

Ionic bonds are present in ionic compounds, which exist in crystalline form at room temperature.

The ionic bond is stronger than the hydrogen bond, and its strength is close to that of the covalent bond.

In a clear calcium hydroxide solution, a sodium carbonate solution is dropped, and a white precipitate is produced. This is a calcium carbonate precipitate formed by the reaction of sodium carbonate and calcium hydroxide, and the reaction is as follows:

na2co3+ca(oh)2===caco3↓+h2o