The answer is A, but please explain why this is. The autoionization of water, as

Question

The answer is A, but please explain why this is.

The autoionization of water, as represented by the equation below, is known to be endothermic. Which of the following correctly states what occurs as the temperature of water is raised? H_2O(l) + H_2O(l) H_3O^+ (aq) + OH^- (aq) a. The pH of the water decreases, and the water becomes more acidic. b. The pH of the water decreases, and the water remains neutral. c. The pH of the water increases, and the water remains neutral. d. The pH of the water does not change, and the water remains neutral. e. The pH of the water increases, and the water becomes more acidic.

Explanation / Answer

If endothermic, it requires HEAT in order to favour products.

then, as we increase T, we are adding HEAT, so this favours products..

a)

note that H3O+ increases, and pH must decrease due to pH = -log(H) BUT the water does not becomes acidic!

b)

this is correct, since H3O+ increases, so pH decreases, but remains neutral since same amount of OH- is present

c)

false, pH will NOT increase, since H3O+

d)

false, it will change, since H3O+ increases, and pH = -log(H3O+)

e)

pH does not increases,

NOTE: water is not "acidic" it is neutal at any temperature since:

[H+] = [OH-] always,

A is not the answer, best answer is B

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