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    Is tap water considered a good disinfectant? Why?

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    Medically no... its considered clean and effectively disinfected
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    if it was a good disinfectant we couldn't drink it...
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    (Original post by SWEngineer)
    Is tap water considered a good disinfectant? Why?

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    This is a really bizarre question. No it's not, why would it be? :confused:
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    The obvious answer is no but your teacher, especially if a supply teacher, might see it differently. Hence the need to explain further so as to score high marks.

    The first step is to define what a disinfectant is and then see whether tap water can satisfy that function. Disinfectants have been defined as "substances that kill microorganisms". Can water do that? No. In fact, food, warmth and moisture are the three main ingredients bacteria need to multiply.

    Although it can be argued that since tap water have been purified with, for example chlorine, it may serve as a good disinfectant. However, that reasoning is flawed because the amount of chlorine used is usually enough to kill the microorganisms in the water in order to make it safe for drinking. Further, the chlorine would have achieved its end-point, i.e. neutralisation. There will not be enough quantity active enough to kill off the microorganisms on, say an open wound (if you are an A&E doctor). In fact, if you have enough chlorine in tap water to kill off microorganisms that water will be undrinkable! You wouldn't drink a cup of DETOL, would you.

    No, Tap water cannot be considered to be a good disinfectant.
 
 
 
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