MDCAT Chemistry MCQ #2244

MDCAT Chemistry MCQ #2244

1. Question 1

   Q1. A student measures the ionic product of water (Kw) at 25°C and 100°C. The value at 100°C is different because:

   • A) Kw remains 10^-14 at all temperatures
   • B) Kw increases as temperature increases
   • C) Kw decreases as temperature increases
   • D) The pH of neutral water remains 7 at 100°C

   Answer: Kw increases as temperature increases

   Explanation: The auto-ionization of water is endothermic, so Kw increases from 10^-14 at 25°C to approximately 10^-12 at 100°C.