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The pH of neutral water at 25°C is 7.0. As the temperature increases, ionisation of water increases, however, the concentration of HX+ ions and OHX− ions are equal. What will be the pH of pure water - Chemistry

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Question

The pH of neutral water at 25°C is 7.0. As the temperature increases, ionisation of water increases, however, the concentration of \[\ce{H+}\] ions and \[\ce{OH-}\] ions are equal. What will be the pH of pure water at 60°C?

Options

  • Equal to 7.0

  • Greater than 7.0

  • Less than 7.0

  • Equal to zero

MCQ

Solution

Less than 7.0

Explanation:

As, Kw increases \[\ce{[H+][OH-] > 10^{-14}}\],
 
As \[\ce{[H+] = [OH-]}\]
 
or \[\ce{[H+] = [OH-] [H+]2 = 110^{-14}}\] 
 
or \[\ce{[H+] > 10^{-7} M}\] 
 
pH < 7.
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Factors affecting equilibrium: Le Chatelier’s principle - Change of Concentration
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Chapter 7: Equilibrium - Multiple Choice Questions (Type - I) [Page 87]

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NCERT Exemplar Chemistry [English] Class 11
Chapter 7 Equilibrium
Multiple Choice Questions (Type - I) | Q 7 | Page 87
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