Litmus test in ACIDS AND BASES – Class 7 Science Experiment

Chapter Name: ACIDS AND BASES

Activity Name: Litmus test in ACIDS AND BASES

Activity Description:

Litmus test in ACIDS AND BASES - Class 7 Science Experiment

In this experiment, we will perform the litmus test on various solutions, including juices of fruits and vegetables, cold drinks, and other solutions, using both blue and red litmus papers. The litmus test is a simple method to identify whether a substance is acidic or basic (alkaline).

Required Items:

  1. Blue litmus paper
  2. Red litmus paper
  3. Solutions of juices from different fruits and vegetables
  4. Cold drinks
  5. Various other solutions (to be specified)

Step by Step Procedure:

  1. Gather all the required items.
  2. Prepare solutions of juices from different fruits and vegetables.
  3. Collect some cold drinks and other solutions to test.
  4. Cut small strips from both blue and red litmus papers.
  5. Dip the blue litmus paper strip into each solution and observe any color change.
  6. Record the observations in Table 3 under the column “Effect on Blue Litmus.”
  7. Rinse and dry the apparatus between tests to avoid contamination.
  8. Now, dip the red litmus paper strip into each solution and again observe any color change.
  9. Record the observations in Table 3 under the column “Effect on Red Litmus.”

Experiment Observations:

TABLE 3

SubstanceEffect on Blue LitmusEffect on Red Litmus
Juice of Fruit ATurns red to blueNo change
Juice of Fruit BNo changeTurns blue to red
Juice of Vegetable ATurns red to blueNo change
Juice of Vegetable BNo changeNo change
Cold Drink XNo changeTurns blue to red
Cold Drink YTurns red to blueNo change
Solution 1No changeNo change
Solution 2Turns red to blueNo change

Note down your observations in below table format

Precautions:

  1. Use clean and dry test tubes or containers for each solution to avoid contamination.
  2. Handle litmus papers with clean and dry hands to get accurate results.
  3. Rinse the litmus papers between tests to remove any residue from previous tests.
  4. Make sure to use fresh litmus papers for each test to ensure reliable results.
  5. Dispose of the used solutions responsibly and follow appropriate waste disposal guidelines.

Lesson Learnt from Experiment:

From the experiment, we observed that substances that turned blue litmus paper to red are acidic, while substances that turned red litmus paper to blue are basic (alkaline).

Substances that did not cause any color change on either blue or red litmus papers are likely neutral in nature. The litmus test is a quick and effective way to determine whether a substance is acidic, basic, or neutral.

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