What is the advantage of a detergent over soap ?
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Detergent are more soluble in water than soap and are unaffected by hardness of water as their calcium and magnesium salts are soluble in water so they do not form scum and cleaning action is easily done.
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State two ways, by which a saturated solution can be changed to unsaturated solution.
What is a soap, what is it used for?
Explain why water that is chemically pure is not necessarily 'potable water'.
Even if water looks clear and has no odour why it might still be unsafe to drink ?