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by Procheta Mallik

Introduction

Collect samples of soil from different sources. Dissolve each of them in water and do a litmus test on the solution.

    • Source the mud/sand from clean areas

    • Wash hands thoroughly after working with the soil samples and urea

    • Do not ingest any of the materials, especially urea, which is toxic

  1. Mix one of the mud samples with some urea In 3 containers, place the following 3 samples: 1) mud, 2) mud with urea and 3) clay. Add a few drops of water to the clay.
    • Mix one of the mud samples with some urea

    • In 3 containers, place the following 3 samples: 1) mud, 2) mud with urea and 3) clay.

    • Add a few drops of water to the clay.

    • Similarly add water to the bottle filled with mud.

  2. Also add some water to the "mud with urea" sample. Also add some water to the "mud with urea" sample.
    • Also add some water to the "mud with urea" sample.

  3. Place half a strip of blue and red litmus paper on the walls of the container filled with clay water. Similarly, repeat the above step by placing blue and red litmus strips in the container filled with  muddy water. And in the container with mud and urea
    • Place half a strip of blue and red litmus paper on the walls of the container filled with clay water.

    • Similarly, repeat the above step by placing blue and red litmus strips in the container filled with muddy water.

    • And in the container with mud and urea

  4. After a few minutes observe whether there are any changes in colour of red and blue litmus paper in each of the different soil samples. Record your observations on the change of colour of the litmus papers.
    • After a few minutes observe whether there are any changes in colour of red and blue litmus paper in each of the different soil samples.

    • Record your observations on the change of colour of the litmus papers.

    • Do not overfill the 3 containers with water.

    • Half a strip of each red and blue litmus paper is sufficient to check the pH of each sample.

    • Do not put too much urea: 4-5 pellets are sufficient to check the pH of "mud with urea".

  5. Observe and record the colour change of the two types of litmus paper in each of the samples. What does the colour change imply?
    • Observe and record the colour change of the two types of litmus paper in each of the samples. What does the colour change imply?

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Suhail Ahanger

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