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Can you use soaps and synthetic detergen...

Can you use soaps and synthetic detergents to check the hardness of water?

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Soaps can be used to check the hardness of water as a sample of soft water will form lather with soap immediately but hard water will form lather only after precipitation of all the `Ca^(2+)` and `Mg^(2+)` ions as calcium and magnesium soaps respectively. Synthetic detergents cannot be used for this purpose as they produce lather with soft as well as hard water.
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Knowledge Check

  • A very good filler of synthetic detergent is

    A
    Sodium tripolyphosphate
    B
    Sodium silicate
    C
    Borax
    D
    Sodium hexametaphosphate

  • Which of the following is a synthetic detergent-

    A
    `C_15H_31COOK`
    B
    `CH_3(CH_2)_6COO^(-)Na^+`
    C
    D
    none of these

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