Common sense?

Chemistry Level 2

Water at room temperature has a neutral pH of 7.But when water is heated to 100 degree C it pH is lowered to 6.13.This means that water has become more acidic.

Is this statement true?

No The question is incomplete Sometimes true Yes

Anik Mandal by Anik Mandal , 21, India

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2 solutions

Mohit Gupta
Dec 5, 2015

pH stands for Potenz hydrogenii .Thus pH =-log[H+] Thus pH is proportional to MOLARITY . At high temp. Volume changes, thus molarity changes....and hence pH changes..... HOWEVER WATER STILL IS NUETRAL IN NATURE

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Raj Magesh
Dec 5, 2015

At higher temperatures, the degree of dissociation of water into the constituent ions H + H^{+} and O H − OH^{-} increases. Due to this, the concentration of H + H^+ increases from 1 0 − 7 M 10^{-7} M to a higher value. When we take the negative logarithm of this concentration, the value decreases from 7 7 to 6.13 6.13 .

This means that the absolute concentration of H + H^+ is higher, but acidity is about the concentration of H + H^+ relative to that of O H − OH^- . In water, these concentrations are equal, and hence water is always neutral.

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