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Science brain teasers require understanding of the physical or biological world and the laws that govern it.


Puzzle ID:#39565
Fun:*** (2.23)
Difficulty:*** (2.66)
Submitted By:shenqiangAcn****!!
Corrected By:jsdodgers




Time has passed, and new technologies have been developed. The job of our nano-laboratory is developing new products of "nano" accuracy. For example, if we develop telescopes, we do not allow an error of even a nanometer in the lenses, because this will result in great error when put to use.

The first project of our laboratory is producing nano-purified water, i.e. no ion is allowed to have a concentration of more than 1 nanomole per liter.

No matter how hard we tried, we failed. Why?


Water is a weak electrolyte. In water at room temperature, the concentration of hydrogen ion and hydroxide ion each equal 10^(-7) mole per liter, which is 100 times 1 nanomole per liter.

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