On heating, calcium carbonate gets converted into calcium oxide and carbon dioxide.
1. Is this a physical or a chemical change ?
2. Can you prepare one acidic and one basic solution by using the products formed in the above process ? If so, write the chemical equation involved.
1. It is chemical change. The chemical equation for the reaction is :
Calcium carbonate $\stackrel{\text { heat }}{\longrightarrow}$ Calcium oxide + Carbon dioxide
2. By adding water to calcium oxide taken in a test tube, a basic solution results. It contains calcium
hydroxide
Calcium oxide + Water $\rightarrow>$ Calcium hydroxide
By passing carbon dioxide through water taken in a tube, carbonic acid is formed. The solution is of
acidic nature
Carbon dioxide + Water $\longrightarrow \rightarrow$ Carbonic acid
Note:
All the three chemical equations are word equations. Symbol equations can also be written for these. For example,
However, you will learn about these in the next class.
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