Chemistry is magical, so let s give us some advice

The equilibrium of lz is actually a system composed of two hydrolytic equilibriums

Sodium carbonate + water (reversible reaction) Sodium bicarbonate + sodium hydroxide, sodium bicarbonate + water (reversible reaction) Carbonic acid + sodium hydroxide;

However, Na+ has nothing to do with hydrolysis and does not promote hydrolysis, while CO3(2-) and HCO3- have a small degree of hydrolysis even when the solution is boiling, so although heating promotes hydrolysis, the amount of HCO3- and H2CO3 does not increase much; When the solution boils, the solute water decreases rapidly, the NaOH concentration increases sharply, and HCO3- is more likely to react with it (the result is that HCO3- and OH- are converted to CO3(2-) and eventually precipitate solid sodium carbonate) rather than hydrolyzed to H2CO3 and then decompose to release CO2 (if this results in the final solid there will be NaOH) or remain unchanged (if this results in the final solid there will be sodium bicarbonate).

The sodium bicarbonate will not decompose into sodium carbonate until the solution is evaporated under normal pressure because the temperature is not enough.

In fact, it is best to ask the teacher a question like this!

I'm dizzy, I studied chemistry in high school!!

I don't know if it's okay!

When you heat up! The concentration of Na(OH) increases, and heating causes the equilibrium to shift to the left!! That's it in the end!!

Sodium bicarbonate is decomposed by heat, and the equation is given upstairs. . .

Also, heating may shift the chemical equilibrium to the left of the equation.

Acid oxide is an oxide that reacts with alkali to form salt and water, generally non-metal oxide, but Mn2O7 is the acid anhydride of permanganic acid, which is an acidic oxide; Basic oxides are oxides that react with acids to form salts and water, all of which are metal oxides. Acidic oxides, basic oxides and amphoteric oxides are salt-forming oxides because they can react with acids or bases to form salts. Non-salt oxides are commonly known as CO and NO.

Metal oxides can be basic oxides (e.g., Na2O), acidic oxides (e.g., Mn2O7), or amphoteric oxides (e.g., Al2O3).

Non-metallic oxides can be acidic oxides (e.g., SO2) or non-salted oxides (e.g., CO).

Acid oxides are a class of oxides that can react with water to form acids or alkalis to form salts and water, but generally do not react with normal salts or acid salts. For example, sulfur trioxide SO3, phosphorus pentoxide P2O5, manganese heptaoxide Mn2O7, chromium trioxide CRO3, etc. Most of the non-metal oxides are acidic oxides.

Oxides that can react with acids to form salts and water are called basic oxides. Basic oxides must be metal oxides, while metal oxides are not necessarily basic oxides, such as Mn2O7 is an acidic oxide, Al2O3, BEO, Cr2O3, Zno, and Mno2 are amphoteric oxides.

Oxides that cannot react with acids and bases to form salts and water are called non-salt oxides. For example, H2O, NO, CO, N2O, NO2, N2O4, Teo, ClO2, and I2O4 are non-salt oxides.

dilute nitric acid, the reduction product is NO; Ag is oxidized to AG+

The chemical equation is 3 ag + 4 hno3 = 3 agno3 + no +2 h2o

The ionic equation is 3 ag + 4 h+ +no3- = 3 ag+ +no +2 h2o

Set: the disturbance quality of CaCO3 in limestone is slow, and the conghui fraction is Zheng Ku xcaCO3+2HCl=CaCl2+H2O+CO2100 44 10x

Carbon dioxide mass: 50+ substituting carbon dioxide into the equation to obtain a calcium carbonate mass of 8 grams, so the carbon defeat beats the calcium carbonate mass fraction.