Valency relationship of reactions between acids and bases

The first generates Na2SO3The second generates na2so4This is by analogy. This must be learned, and the college entrance examination is more useful! Some don't have like SO3, SO4, but don't worry, he's more unresponsive.

I also have an understanding: when SO2 enters the solution of NaOH, it reacts with H2O (water) to form H2SO3, which is then neutralized; SO3 and water form H2SO4, so the neutralization product is different. How, okay.

Someone has talked about the use, and they are right.

The valence state is calculated according to the sum for o. This will involve redox reactions in high school, so let's learn about it later.

When there is a small amount of SO2: SO2 + NaOH = NaHSO3 or when SO3 is excessive: SO2 + 2NAOH = Na2SO3 + H2O, it is used industrially to absorb SO2

so3+2naoh=na2so4+h2o

SO2 and SO3 are oxides of two different valence states of sulfur, with S being +4 valence in SO2 and +6 valence in SO3.

so2+ 2naoh***** na2so3+h2o

The valency of S in SO2 and Na2SO3 has not changed, and it can be used to remove SO2 and prevent environmental pollution.

6. I can't react.

5 products barium sulfate and water and sodium sulfate.

4 The products are potassium carbonate and water.

3 The products are potassium sulfate and water.

2 The product is sodium carbonate.

Potassium carbonate and water.

1 The product is sodium sulfate.

Potassium sulfate and water.

I don't think it's necessary to overdose the products of the problem are salts, and they should not react with alkalis and bicarbonate sulfates.

Ba2+ +OH- +H+ +SO42-=BASO4 +H2OBa2+ +2OH- +2H+ +SO42-=BASO4 +2H2O1 BA(OH)2 excess, 2 NaHSO4 excess, 2 NaHSO4 reactions, so it is NaHSO4 overdose.

1. Add NaHSO4 solution drop by drop to the BA(OH)2 solution until it no longer generates precipitate, indicating that Ba2+ and (SO4)2- are completely reacted in equal amounts (1:1). This is equivalent to an excess of Ba(OH)2, as the H+ and OH- reactions to produce water continue to occur with the addition of NaHSO4.

Chemical equation: Ba(OH)2 + NaHSO4 = BASO4 (white precipitate) + NAOH + H2O

Ion equation: Ba2+ +OH- +H+ +SO4)2- = BaSO4 (white precipitate) +H2O

2. NaHSO4 solution is added dropwise to the Ba(OH)2 solution to neutralization, indicating that H+ and OH- are exactly the same amount (1:1) of complete reaction at this time. At this time, it is equivalent to an excess of NaHSO4, and the reaction can no longer be continued by adding it.

Chemical equation: Ba(OH)2 + 2NaHSO4 = BASO4 (white precipitate) + Na2SO4 + 2H2O

Ion equation: Ba2+ +2OH- +2H+ +SO4)2- = BaSO4 (white precipitate) + 2H2O

1. Concept: Resistant to jujube kinase acid and alkali neutralization reaction.

It is a chemical reaction in which an acid reacts with a base to produce salts and water.

2. Essence: Its essence is that H+ in the acidic solution and OH in the alkaline solution combine to form neutral water H2O. （h+ +oh－＝h2o。）

3. Phenomenon: In the process of acid-base neutralization reaction, there will be very obvious chemical phenomena in Changsocks, such as the appearance of precipitate (salt), of course, in the medium rock source and reaction of some acid-base substances, there will be no too obvious phenomenon changes, at this time, we need to determine whether the neutralization reaction occurs with the help of some acid-base reagents.

Acids: cations are all hydrogen ion compounds.

Bases: Anions are all compounds of hydroxide ions.

Salt: The cations are all metal ions or ammonium ions, and the anions are all acid ions.

Acids: H2SO4, HCl, HNO3, H2CO3

Bases: NaOH, Ca(OH)2, BA(OH)2, KOH, Mg(OH)2

Salts: (NH4)2SO4, CASO4, NA2SO4, NACL, NA2CO3

Valence: H is positive monovalent, Cl is negative bivalent, CO3 is negative bivalent, SO4 is negative bivalent, Mg is positive bivalent, OH is negative bivalent, BA is positive bivalent, Na is positive monovalent, NH4 is positive monovalent, Ca is positive bivalent, K is positive monovalent.

All of the above are hand-hit. It's so hard. There are also numbers that are subscripts, and the valence is compared to see it yourself!

I just learn this at school now.

The above is all junior high school knowledge, and there may be discrepancies in high school.

Select. Thank you. qaq

To put it simply, it is a metal and non-metallic compound that Xiaoyou has talked about. You must have taken notes on the first school case (that is, the connection between middle and high school). It's right on top of the acid-base salt o( o haha

The valence of the compound itself is 0, for example, the total valency of Cao is 0, where Ca is +2 valence, and O is the -2 valence.

Similarly, HCL itself is 0, H is +1, and Cl is -1.

The reaction of CAO with HCl is not a redox reaction, therefore, there is no valency change.

Ca is +2 valence in CaO, and the generated CaCl2 is still +2 valence, Cl in HCL is -1 valence, and CaCl2 is also -1 valence.