The pH of pure water at 250C and 450C are 7 and 5.5 respectively. Calculate the heat of dissociation of H2O into H+ and OH- ions.
65.5 kcal/mol
98.5 kcal/mol
10 kcal/mol
Data inadequate
We have given,
Now using the van't Hoff's equation for the dependance of Keq on the Temperature,
Here, R = 2cal /mol.K
T1 = 25 0C = 298 K
T2 = 45 0C = 318 K
putting this values in the above equation.
Hence, the correct answer is Option (1)
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