When calcium oxide reacts with nitric acid, it produces calcium nitrate and water. The reaction is as follows:
CaO + 2HNO3 → Ca(NO3)2 + H2O
The addition of universal indicator at the start of the reaction will give a green color to the solution as the indicator will be in its neutral state. As the reaction progresses, the solution will turn from green to yellow as the acid begins to neutralize the basic calcium oxide. As the reaction reaches completion, the solution will turn red, indicating that all the acid has been used up and the solution is acidic due to the formation of calcium nitrate.
Therefore, the color changes throughout the reaction would be green → yellow → red.
calcium oxide and nitric acid react. at the start of the reaction, some universal indicator is added. suggest how the colour changes throughout the reaction.
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