The pH of water at 25°c is 7. When it is heated to 100°C, the pH of water ________

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SSC MTS (Held On : 07 Oct 2021 Shift 1) Memory Based Paper
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  1. Increases
  2. Decreases
  3. Remains same
  4. Decreases up to 27°C and then increases 

Answer (Detailed Solution Below)

Option 2 : Decreases
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SSC MTS 2024 Official Paper (Held On: 01 Oct, 2024 Shift 1)
90 Qs. 150 Marks 90 Mins

Detailed Solution

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  • The pH of water at 25°c is 7. When it is heated to 100°C, the pH of water decreases to 6.14.
  • On increasing the temperature of the water, the equilibrium would again move to lower the temperature.
  • It would happen by absorbing the extra heat. 
  • Hydrogen ions and hydroxide ions will remain at the same concentration in pure water and the water remains neutral even if its pH changes.
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