Practice question

Given: For Ca(OH)2(s) <=> Ca²+ + 2OH-, K_{sp = 5.5 × 10⁻⁶. What is [Ca²+] in 0.01 M NaOH ? These values define the system as per NCERT data. Formula: K_{sp = [Ca²+][OH-]², [OH-] = 0.01 + 2S approx 0.01. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: 5.5 × 10⁻⁶= [Ca²+] · (0.01)², [Ca²+] = 5.5 × 10⁻² M. 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.