The Amphoteric Reaction Between Two Water Molecules Is Endothermic, Which

question 161

Multiple Choice

The amphoteric reaction between two water molecules is endothermic, which means that this reaction requires the input of energy in order to proceed: Energy + H₂O + H₂O → H₃O⁺ + O H^-
The warmer the temperature of the water, the more thermal energy is available for this reaction, and the more hydronium and hydroxide ions are formed. Based on this information, should the value of K_w be expected to increase, decrease, or stay the same with increasing temperature?

• A)The value of K_w will stay the same, since it is a constant.
• B)The value of K_w will decrease, since there are more hydronium ions than hydroxide ions.
• C)The value of K_w will increase since the rise in temperature allows for a higher concentration of both ions.
• D)The value of K_w will decrease since there are more hydroxide ions than hydronium ions.

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