K_w for the auto-ionization of water, H₂O(l)$\rarr$ H⁺(aq)+ OH^- (aq), is 1.0 × 10^-14.What are the signs (+/-)of $\Delta$S° and $\Delta$H° for the reaction at 25°C? A)($\Delta$S° = (+)and $\Delta$H° = (+)) B)($\Delta$S° = (+)and $\Delta$H° = (-)) C)($\Delta$S° = (-)and $\Delta$H° = (+)) D)($\Delta$S° = (-)and $\Delta$H° = (-))

Question

Quizplus · Accepted Answer

The auto-ionization of water is an endothermic process ($\Delta$H° > 0) because it requires energy to break the O-H bonds in the water molecules. The reaction also leads to an increase in the number of ions in solution, which increases the entropy of the system ($\Delta$S° > 0).

Kw for the Auto-Ionization of Water, H2O(l) →\rarr→ H+(aq)+ OH- (Aq), Is 1

K_w for the Auto-Ionization of Water, H₂O(l) $\rarr$ H⁺(aq)+ OH^- (Aq), Is 1