Question

Решите цепочку превращений, последнюю реакцию рассмотрите в свете ТЭД. Укажите тип реакций. (7 баллов) C – CO2 – H2CO3 – K2CO3

Answer 1

C + O2 -> CO2   (соединение)
CO2 + H2O -> H2CO3   (соединение)
H2CO3 + 2KOH -> K2CO3 + 2H2O
2H(+) + CO3(-2) + 2K(+) + 2OH(-) -> 2K(+) + CO3(-2) + 2H2O
2H(+) + 2OH(-) -> 2H2O

Answer 2

Chain of Transformations and Reaction Types

The given chain of transformations is as follows: C – CO2 – H2CO3 – K2CO3. Let's examine each transformation and the corresponding reaction type in the context of thermodynamics and reaction kinetics.

1. C to CO2: - This transformation represents the combustion of carbon (C) to form carbon dioxide (CO2). - The reaction is an example of a combustion reaction, which is an exothermic reaction that releases energy in the form of heat and light. - The balanced chemical equation for this reaction is: C + O2 -> CO2.

2. CO2 to H2CO3: - This transformation represents the dissolution of carbon dioxide (CO2) in water (H2O) to form carbonic acid (H2CO3). - The reaction is an example of a hydration reaction, where a compound reacts with water to form a new compound. - The balanced chemical equation for this reaction is: CO2 + H2O -> H2CO3.

3. H2CO3 to K2CO3: - This transformation represents the neutralization of carbonic acid (H2CO3) with potassium hydroxide (KOH) to form potassium carbonate (K2CO3). - The reaction is an example of an acid-base reaction, where an acid reacts with a base to form a salt and water. - The balanced chemical equation for this reaction is: 2H2CO3 + 2KOH -> K2CO3 + 2H2O.

Conclusion

In summary, the given chain of transformations involves the combustion of carbon (C) to form carbon dioxide (CO2), the dissolution of carbon dioxide in water to form carbonic acid (H2CO3), and the neutralization of carbonic acid with potassium hydroxide to form potassium carbonate (K2CO3). The reaction types involved in these transformations are combustion, hydration, and acid-base reactions, respectively.