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 increas

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 :At `25^(@)C, [H^(+)]=[OH^(-)]=10^(-7) and K_(w) = [H^(+)][OH^(-)]=10^(-14)`. On HEATING, `K_(w)` increases , i.e, `[H^(+)][OH^(-)] gt 10^(-14)`. As `[H^(+)]=[OH^(-)],[H^(+)]^(2) gt 10^(-14) ` or `[H^(+)] gt 10^(-7) M or pH lt 7`.