Acids and Bases Question 2

Which of the following accounts for the observation that the pH of pure water at 37 $^\circ$ C is 6.8 ?

At 37

^\circ

C water is naturally acidic.

At 37

^\circ

C the autoionization constant for water,

K_w

, is larger than it is at 25

^\circ

At 37

^\circ

C water has a lower density than it does at 25

^\circ

C; therefore,

[\ce{H+}]

is greater.

At 37

^\circ

C water ionizes to a lesser extent than it does at 25

^\circ