MDCAT Chemistry MCQ #2211

MDCAT Chemistry MCQ #2211

1. Question 1

   Q1. According to the PTB textbook, what is the value of the ionic product of water (Kw) at exactly 25°C?

   • A) 1.0 × 10⁻ⁱ⁴ mol²dm⁻⁶
   • B) 14.0 mol²dm⁻⁶
   • C) 1.0 × 10⁻⁷ mol²dm⁻⁶
   • D) 7.0 mol²dm⁻⁶

   Answer: 1.0 × 10⁻ⁱ⁴ mol²dm⁻⁶

   Explanation: At 25°C, Kw = [H+][OH-] = 10⁻¹⁴. Option B is the pKw value, which is the negative log, not the product itself.