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शुद्ध जल को `25^(@)C` से `80^(@)C` तक गर्म करने पर `K_(w)` का मान `1.0xx10^(-14)` से बढ़कर `0.25xx10^(-12)` हो जाता है `80^(@)C` पर जल की pH की गणना कीजिए तथा बताइये की जल की प्रकति क्या होगी?

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सुध जल हेतु `K_(w)=[H^(+)][OH]`
`:. [H^(+)]=[OH^(-)]`
`:. [H^(2)]=K_(w)=0.25xx10^(-12)`
`:. [H^(+)]=0.5xx10^(-6)`
या `pH=-log[ 0.5xx10^(-6)]=6.3010`
चूँकि pH का पैमाना 0 से `12.602` हो गया है और `ph6.3010` मध्य बिंदु है, अतः गर्म करने पर जल की `pH6.3010` होगी और जल उदासीन ही रहेगा ।

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