Chemistry · EQUILIBRIUM

Consider the following statements regarding the pH scale and ionic product of water: (A) At 298 K, \( \text{p}K_w = \text{pH} + \text{pOH} = 14 \). (B) An increase of one unit on the pH scale represents a tenfold decrease in \( [\text{H}^+] \). (C) For an acidic solution at 298 K, \( [\text{H}_3\text{O}^+] < [\text{OH}^-] \). (D) A pH meter measures pH with an accuracy within 0.001 precision based on electrical potential. Which of the above statements are correct?

1. A
   (A), (B) and (C) only
2. B
   (B) and (C) only
3. C
   (A), (B) and (D) only
4. D
   (A) and (C) only