Question

K-KOH-KHCO3-K2CO3-CO2-CaCO3-Ca(HCO3)2

Answer 1

2K + 2H2O = 2KOH + H2

KOH + CO2 = KHCO3

2KHCO3 (t)= K2CO3 + H2O + CO2

CO2 + CaO = CaCO3

CaCO3 + H2O + CO2 = Ca(HCO3)2

Answer 2

The sequence you provided represents a series of chemical reactions involving various compounds. Let's break it down step by step:

1. K: This symbol represents potassium, which is an alkali metal.

2. KOH: It stands for potassium hydroxide, which is a strong base. It is formed by the combination of potassium (K) and hydroxide (OH-) ions.

3. KHCO3: This compound is potassium bicarbonate. It is formed by the reaction between potassium hydroxide (KOH) and carbon dioxide (CO2). The chemical equation for this reaction is:

   2 KOH + CO2 -> KHCO3 + H2O

4. K2CO3: It represents potassium carbonate, which is formed by the decomposition of potassium bicarbonate (KHCO3). The reaction equation is:

   2 KHCO3 -> K2CO3 + CO2 + H2O

5. CO2: It stands for carbon dioxide, a colorless gas that is produced during the decomposition of potassium bicarbonate.

6. CaCO3: This compound represents calcium carbonate, which is a white solid. It can be obtained from natural sources like limestone or can be synthesized. Calcium carbonate is commonly used in various industries and has applications in medicine, agriculture, and construction.

7. Ca(HCO3)2: It represents calcium bicarbonate, which is formed when carbon dioxide reacts with calcium carbonate in the presence of water. The chemical equation for this reaction is:

   CaCO3 + CO2 + H2O -> Ca(HCO3)2

Overall, the sequence you provided involves the conversion of potassium hydroxide to potassium bicarbonate, followed by the decomposition of potassium bicarbonate into potassium carbonate, carbon dioxide, and water. Additionally, it includes the formation of calcium bicarbonate through the reaction between carbon dioxide and calcium carbonate.