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by Procheta Mallik


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
    • 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.

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

    • 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

    • 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".

    • 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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