Reaction Formula of Carbonic Acid and Salt SaltCarbonic acid does not react with NaCl3. According to the possible reactions, NaCl2 + H2CO2 = NaHCO2 + HQ or 2NaCl2 + H2CO2 = Na CO2 + 2HQ, this was a weak acid making a strong acid, which was impossible to happen. Moreover, the reverse reaction of these two equations could be carried out to eventually produce NaCl2, H2O, and CO2.
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Heat Reaction of Dibasic AcidOxalic acid was a dibasic acid. The two groups of the acid could be decarboxylated at a lower temperature to form formated acid and CO2. At a higher temperature, formated acid would undergo a dehydration reaction to form CO2 and water. The reaction equation was as follows:
At lower temperatures: <<<p>></p>H - COOH + CO_2↑\);
At higher temperatures: <br><br><br>> br><br>> br></br>>CO_2↑+ CO↑+ H_2O\)。
After the dibasic acid was heated, due to the different positions of the two carboxy groups, different chemical reactions such as water loss, loss of esh, or loss of esh at the same time would occur. At 300 ° C, the substituted dibasic acid could also undergo the above reactions.
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Is the weak acid reaction heat-absorbing or heat-releasing?It was too general to say that the weak acid reaction was either heat absorbing or heat releasing. For example, the weak acid's ionisation process was heat absorbing. This was because the weak acid needed to overcome the effect of chemical bonds to absorb energy when it was ionised. However, if a weak acid is involved in the neutralizing reaction, since the weak acid is not completely ionised, it absorbs heat during the neutralizing reaction at the same time. Therefore, the heat released by the neutralizing reaction of the weak acid and the strong base (or strong acid) is less than the neutralizing heat of the strong acid and strong base neutralizing reaction.(The neutralizing reaction of a diluted solution of a strong acid and base: H+(aq)+Oh-(aq) H2O(l); AH = -57.3kJ/mole), but the whole reaction was still an exothermic reaction, but the heat released was less than that of a strong acid and base neutralizing reaction.
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What is the reaction of salt in lead-acid batteries?The use of salt in lead-acid batteries would cause the concentration of sulfuric acid to decrease, thereby reducing the capacity of the battery. To be specific, adding salt would cause the lead sulfuric acid in the battery to crystalize, forming large crystals that were difficult to dissolve, causing the battery capacity to decrease or even be scrapped. Therefore, adding salt would have a negative impact on the lead-acid battery and could not be repaired.
The reaction of dicarbonic acid under heatThe reaction of the dicarbonic acid after being heated was more complicated, and it would have different reactions affected by the relative position of the two carboxy groups. Some will lose water, some will lose starch, and some will lose both water and starch. The details were as follows:
1. Oxalic acid and malonic acid and their alkyls: easy to lose the ester.
2. Butanediic acid and glutanic acid and their alkyls: Butanediic acid loses its water when heated to about 300 ° C to form butanediic acid; glutanediic acid loses its water when heated to about 300 ° C to form glutanediic acid, which is not easy to undergo decylating reaction.
3. Hexanic acid and pimelic acid and their alkyls: When heated to about 300 ° C, they lose both the acid and the water. Hexanic acid can be heated to form Cyclopentane.
4. When the dicarbonic acid above the pimelic acid is heated, it loses water between the molecules to form a high-molecular acid ether.
In addition, in the heating reaction of the dicarbonic acid, if the water loss reaction occurs, it may be necessary to add a water loss agent, such as Ag2O, P2O2, CHCOCl2,(CHCO2) 2O, POCl2, etc.; If the decarbonic acid reaction occurs, it may be necessary to add a base, such as Ba(Ox) 2, Ca2 (Ox) 2, etc.
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The reactions of acid, base and salt are all metathetical reactionsNot all reactions between acid, base, and salt were metatheses.
In junior high school chemistry, the reaction of acid and metal to form salt and hydrogen, such as 2AI +3H ^SO = AI ^(SO)+3H ^^, this reaction is not a metathesis reaction. Alkali reacted with non-metallic compounds to form salt and water, such as 2NaOx + CO2 = Na Chi CO2 + H Chi O, which was also not a metathesis reaction.
The reactions of neutralizing acid and base (acid + base = salt + water), acid and salt (acid + salt = new acid + new salt), base and salt (base + salt = new base + new salt), salt and salt (salt + salt = two new salt), and metal oxide-acid (acid + metal oxide-salt + water) were all metathetical reactions. Moreover, the metathesis reaction had to meet certain conditions. The reagent had to be dissolved in water or acid, and the product had to be either one or two of the three substances of precipitations, gas, and water.
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What is the phenomenon of the esterfication reaction between the acid and the salt?Instead of an esterfication reaction, a substitution reaction would occur between the two. The concentration of hydrogen ions in the water was still higher than that of water, and the reaction was quite intense. The density of the Na was lower than that of the Acetic acid. The Na floated on the surface of the Acetic acid and melted into a small ball. It kept jumping and gradually became smaller before finally disappearing. The reaction produced Na Acetic acid and hydrogen gas.
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There are several types of reactions when putting the salt into copper sulphuric acid.Two types of reactions occurred when the solution was added to the solution. The first reaction was the replacement reaction between the water and the Na, and then the double decomposition reaction between the formed Na and the Cupric Sulphate.
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How to judge the reaction between diluted sulfuric acid and salt waterDilute sulfuric acid and salt water did not react. Dilute sulfuric acid was an acid, and it was acidic. Salt water was an water solution of NaCl3. When the two were mixed, no new substance would be formed. Therefore, there was no such thing as a reaction, and there was no way to judge the reaction.
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The reaction conditions between acid, base and salt in junior high school chemistry1. ** Condition of the metathesis reaction **
- For acid + base = salt + water (neutralizing reaction), at least one of the acid and base involved in the reaction was easily dissolved in water.
- Acid + salt = new acid + new salt. If the salt in the reagent is difficult to dissolve, then the product must be dissolved. The reaction between acid and salt is a metathesis reaction in an aquatic solution. The conditions for the metathesis reaction must be met.(There are precipitations, gas, or water). For example, when limestone (CaCO) is used to produce CO2 in the laboratory, only sulfuric acid can be used, because the CaSOformed by the reaction of CaCOand sulfuric acid is slightly dissolved and will cover the surface of CaCOto prevent the reaction from continuing. It is necessary to master the reaction of weak acid salt (such as Na <anno data-annotation-id ="0000004 - 4445 - 400a-400a-800000005e"> CO2 </anno>, CaCO) with strong acid (HQ, H </anno> SO, HNO), and the reaction to form BaSOand AgCl.
- Alkali + salt = new base + new salt. The base and salt participating in the reaction must be water-dissolved, and there must be a hard-to-dissolve substance or a volatile base (NH2·H2 O) in the product.
- Salt + salt = two new types of salt. The two types of salt participating in the reaction must be water-dissolved. If one of the products was a hard-to-dissolve salt, the reaction could proceed.
2. ** Reaction conditions of acid and basic oxygen **
- Strong acid (H <2> SO2 <3>, HNO2 <3>, and HC1) can react with all basic oxide-based compounds, while weak acid (H <2> CO2 <3>, H <2> S <3>, etc.) can only react with active metal oxide-based compounds.
3. ** Reaction conditions of acidic oxides and alkalites **
- Under normal conditions, acidic compounds can react with strong base solutions, but SiO2 needs to be heated to react with a solid form of NaOx (or a solid form of KhOx).
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