Question

Ca →CaO → Ca(OH)2 → CaCl2 → CaSO4→ CaSO3

Answer 1

2Ca+O2=2CaO 
CaO+H2O=Ca(OH)2 
Ca(OH)2+2HCl=CaCl2+2H2O 
CaCl2+H2SO4=CaSO4+2HCl
CaSO4 + Na2CO3 = CaCO3↓ + Na2SO4

Answer 2

The sequence you provided describes a series of chemical reactions involving calcium (Ca) and various compounds. Here's a breakdown of each reaction:

1. Ca → CaO: This reaction represents the formation of calcium oxide (CaO) from calcium (Ca). It occurs when calcium reacts with oxygen (O) in the air or in the presence of heat.

2. CaO → Ca(OH)2: The second reaction involves the reaction of calcium oxide (CaO) with water (H2O) to produce calcium hydroxide (Ca(OH)2). This is an example of a hydration reaction.

3. Ca(OH)2 → CaCl2: In this reaction, calcium hydroxide (Ca(OH)2) reacts with hydrochloric acid (HCl) to form calcium chloride (CaCl2) and water (H2O).

4. CaCl2 → CaSO4: The fourth reaction involves the reaction of calcium chloride (CaCl2) with sulfuric acid (H2SO4) to produce calcium sulfate (CaSO4) and hydrochloric acid (HCl).

5. CaSO4 → CaSO3: The final reaction describes the reduction of calcium sulfate (CaSO4) to calcium sulfite (CaSO3). This reaction typically requires reducing agents like carbon or sulfur dioxide.

It's important to note that these reactions are simplified representations and may not account for specific reaction conditions or stoichiometric ratios. Additionally, the reactions involving acids should be conducted with appropriate safety precautions due to their corrosive nature.