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To prepare a soap by cold …

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To prepare a soap by cold process 

    • Posted by Raj Kumar 7 years ago

    CBSE > Class 10 > Science
    • 1 answers

    Shweta Gulati 7 years ago

    • Take 25 ml of coconut oil in a measuring cylinder and pour it into a 250 ml glass beaker.
    • Measure 30 ml of 20% NaOH solution in another measuring cylinder and add it into the beaker containing vegetable oil.
    • Vigorously stir the mixture using a glass rod.
    • Touch the beaker from outside.  It is observed that the beaker is warm.
    • Place the beaker on a wire gauze placed over a tripod stand.
    • Heat the beaker using a Bunsen burner till the mixture become a whitish paste.
    • Remove the beaker from the flame and allow it to cool.
    • Dip a red litmus paper in the suspension formed.
    • When dipped in the suspension, the red litmus paper changes its colour to blue.
    • Dip a blue litmus paper in the suspension.
    • The colour of blue litmus paper remains the same.
    • To the above suspension, add 15g of common salt and stir it well with a glass rod.
    • After adding common salt, soap in the suspension gets precipitated out as solid.
    • Take a filter funnel and place a filter paper in it and fix it in a stand.
    • Place a beaker below the funnel.
    • Pour the contents of the beaker into the funnel over a glass rod and filter the contents of the beaker.
    • After filtration, soap is left behind in the filter paper.
    • Transfer the soap into another filter paper using a spatula and dry it by pressing with another filter paper.
    • Then, cut it into desired shape with a knife.

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