Basic solution in Chemical Reactions and Equations – Class 10 Science Experiment

Chapter Name: Chemical Reactions and Equations

Activity Name: Basic solution in Chemical Reactions and Equations

Activity Description:

In this experiment, we observe the reaction between quicklime (calcium oxide) and water, which results in the formation of a basic solution. The heat energy released during the reaction is also noted.

Required Items:

  1. Quicklime (Calcium Oxide)
  2. Water
  3. Beaker
  4. Litmus Paper (both red and blue)

Step by Step Procedure:

  1. Take approximately 1 g of quicklime (calcium oxide) and place it in a beaker.
  2. Add 10 ml of water to the beaker containing quicklime.
  3. Carefully touch the outer surface of the beaker with your finger.
  4. Observe and note down your observations.

Experiment Observations:

  • The beaker feels hot when touched. This is because heat energy is released during the reaction between calcium oxide and water.
  • Calcium oxide dissolves in water, forming a colorless solution.

Testing the nature of the solution with litmus paper:

  • Dip a red litmus paper into the solution.
  • The red litmus paper turns blue upon contact with the solution.

Nature of the solution: The solution obtained after the reaction between calcium oxide and water is basic, as indicated by the blue color change of the red litmus paper to blue.


  1. Handle calcium oxide with care, as it can irritate the skin and eyes.
  2. Use a heat-resistant beaker to avoid any accidents due to the heat generated during the reaction.
  3. Perform the experiment in a well-ventilated area to disperse any fumes produced during the reaction.

Lesson Learnt from Experiment:

Through this experiment, we learn that the reaction between calcium oxide and water is exothermic, releasing heat energy. The resulting solution is basic, as confirmed by the blue color change of the red litmus paper.

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