The pH of neutral water at 25^@C is 7.0. As the temperature increases, ionisation of water increases, however, the concentration of H ions and OH^-ions are equal. What will be the pH of pure water at 60^@C ?

The pH of neutral water at 25^@C is 7.0. As the temperature increases,

1.	The pH of neutral water at 25^@C is 7.0. As the temperature increases, ionisation of water increases, however, the concentration of H ions and OH^-ions are equal. What will be the pH of pure water at 60^@C ?
Answer» Equal to 7.0 Greater than 7.0 Less than 7.0 Equal to zero Solution :The PH of neutral WATER at `25^@C` is 7.0. As `25^@C[H^+]=[OH^-]=10^(-7)` `K_w=[H^+][OH^-]=10^(-14)` On heating , `K_w` increases, i.e., `[H^+][OH^-] gt 10^(-14)` As `[H^+]=[OH^-]` or , `[H^+]^2 gt = 10^(-14)` or `[H^+] gt 10^(-7)` M `therefore pH lt 7` With rise in temperature, pH of pure water decreases and it become less than 7 at `60^@`C.