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

options

increases

remains same

decreases

decreases then increases

Dissociation of water is temperature dependent H2O ⇋ H+ + OH– Dissociation constant = Kw = [OH–] [H+] Water at 100°C will have more of the molecules dissociated to ions then at 25°C i.e., Kw increase with increase in temperature. ∴ pH of water decreases on increasing temperature.  At 100°C pH of water becomes 6.14

 

hence option C iw correct