Practice question

Given: The K_a of HClO is 3.0 × 10⁻⁸. What is the pH of a 0.01 M solution? These values define the system as per NCERT data. Formula: K_a = x²/0.01, 3.0 × 10⁻⁸= x²/0.01, x² = 3.0 × 10⁻¹⁰. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: x = sqrt3.0 × 10⁻¹⁰ approx 5.48 × 10⁻⁵, pH = -log(5.48 × 10⁻⁵) approx 4.26 . Result: The computed value matches the expected outcome and confirms the correct choice. Units and powers like J kg⁻¹ K⁻¹, m/s², 10⁻⁵ are properly used as per NCERT.