You are provided with two samples A and B.sample A is hedrochloric acid while sample B is sodium hydroxide solution.How will you test both the samples by using pH paper?

Question

Answer

First ,we can put ph paper in any of the solution and then the colour will be changed I.e if colour changes to violet then the solution is sodium hydroxide because it is a highly basic solution and if colour changes to red it means the solution is hydrochloric acid becoz it is strong acid.
Colour of ph paper change to red with strong acid.
Colour of ph paper change to violet with strong base.

Answer

On testing sample A using a pH paper, the colour of the paper changes to red. On the other hand, on testing sample B using a pH paper, the colour of the paper changes to green. Thus it shows that sample A is a strong acid and sample B is a strong base.

Answer

Testing Samples A and B Using pH Paper

Introduction:

In this experiment, we will be testing two samples, A and B, using pH paper. Sample A is hydrochloric acid (HCl), which is an acidic solution, while sample B is sodium hydroxide (NaOH) solution, which is a basic solution. pH paper is a simple and effective tool used to determine the acidity or basicity of a solution based on its pH level.

Materials Required:

- Sample A (hydrochloric acid)
- Sample B (sodium hydroxide solution)
- pH paper
- Dropper or pipette
- Distilled water (if required)

Procedure:

1. Gather and label the samples:
- Take two separate containers and label them as Sample A and Sample B.
- Pour a small amount of hydrochloric acid into the container labeled Sample A.
- Similarly, pour a small amount of sodium hydroxide solution into the container labeled Sample B.

2. Obtain pH paper:
- Take a strip of pH paper from the pH paper roll.
- Make sure to handle the pH paper only from the edges to avoid contamination.

3. Testing Sample A (hydrochloric acid):
- Dip the pH paper into the container containing Sample A.
- Hold the pH paper in the solution for a few seconds to allow it to react with the acid.
- Remove the pH paper from the solution and observe the color change.
- Compare the color of the pH paper with the color chart provided with the pH paper roll.
- The color change on the pH paper will indicate the acidic nature of Sample A.

4. Testing Sample B (sodium hydroxide solution):
- Rinse the pH paper with distilled water to remove any traces of Sample A.
- Dip the pH paper into the container containing Sample B.
- Hold the pH paper in the solution for a few seconds to allow it to react with the base.
- Remove the pH paper from the solution and observe the color change.
- Compare the color of the pH paper with the color chart provided with the pH paper roll.
- The color change on the pH paper will indicate the basic nature of Sample B.

5. Record and interpret the results:
- Record the pH values obtained for both Sample A and Sample B.
- pH values below 7 indicate acidity, while pH values above 7 indicate basicity.
- Based on the color change observed on the pH paper and the corresponding pH values, determine whether Sample A is acidic and Sample B is basic.

Conclusion:

By using pH paper, we can easily determine the acidity or basicity of a solution. In this experiment, we tested Sample A (hydrochloric acid) and Sample B (sodium hydroxide solution) using pH paper and interpreted the results based on the color change and corresponding pH values. pH paper is a convenient and reliable method for quickly assessing the pH of various solutions.

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