Reaction o f HCl and methyl orange in Acids, Bases and Salts – Class 10 Science Experiment

Chapter Name: Acids, Bases and Salts

Activity Name: Reaction o f HCl and methyl orange in Acids, Bases and Salts

Activity Description:

In this experiment, we will observe the reaction between dilute hydrochloric acid (HCl) and methyl orange indicator, followed by the addition of antacid tablet powder to the solution. Methyl orange is an acid-base indicator that changes color in the presence of acids and bases, helping us visualize the reaction.

Required Items:

  1. Dilute hydrochloric acid (HCl)
  2. Methyl orange indicator
  3. Antacid tablet powder
  4. Beaker

Step by Step Procedure:

  1. Take a clean beaker and pour a small amount of dilute HCl into it.
  2. Add two to three drops of methyl orange indicator to the HCl solution.
  3. Observe and note the initial color of the solution. Methyl orange will show a specific color depending on the pH of the solution.
  4. Add a small amount of antacid tablet powder to the beaker containing the HCl and methyl orange solution.
  5. Carefully observe the change in color of the solution after adding the antacid powder.

Experiment Observations:

  • Initial color of HCl and methyl orange solution: [Note the color]
  • Color of the solution after adding antacid tablet powder: [Note the changed color]


  1. Handle dilute hydrochloric acid with care as it is a corrosive substance. Wear appropriate protective equipment such as gloves and safety goggles.
  2. Use a clean beaker to avoid contamination of the reaction.
  3. Add the antacid tablet powder in small amounts to control the reaction and avoid excessive foaming.

Lesson Learnt from Experiment:

The experiment demonstrates the neutralization reaction between an acid (HCl) and a base (antacid tablet powder). The change in color of the solution from the initial color of the HCl-methyl orange mixture to a different color after adding the antacid tablet powder indicates the occurrence of a chemical reaction.

The antacid powder, which is a base, neutralizes the acid, resulting in the change of pH and, consequently, the color of the methyl orange indicator.

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