Question

Ca->CaO->Ca(OH)2->CaCO3

Answer 1

2Ca+O2=2CaO
CaO+2NaOH=Na2O+Ca(OH)2
Ca(OH)2+K2CO3=CaCO3+2KOH

Answer 2

The sequence you provided represents the chemical reactions involving calcium (Ca) that result in the formation of calcium carbonate (CaCO3). Here's a breakdown of each step:

1. Ca -> CaO: This reaction represents the conversion of calcium (Ca) to calcium oxide (CaO), also known as quicklime. It is achieved by heating calcium metal in the presence of oxygen.

2. CaO -> Ca(OH)2: Calcium oxide (CaO) reacts with water (H2O) in a process called hydration to form calcium hydroxide (Ca(OH)2), commonly known as slaked lime or hydrated lime. This reaction is exothermic, meaning it releases heat.

3. Ca(OH)2 -> CaCO3: Calcium hydroxide (Ca(OH)2) undergoes carbonation when exposed to carbon dioxide (CO2) in the air, forming calcium carbonate (CaCO3). This reaction is commonly observed when slaked lime is left in contact with the atmosphere for an extended period, such as in the natural process of carbonation.

Overall, the sequence you provided describes the transformation of calcium metal (Ca) into calcium carbonate (CaCO3) through the intermediate steps of calcium oxide (CaO) and calcium hydroxide (Ca(OH)2).