What is K_b for the conjugate base of HCN (K_a = 4.9 × 10⁻¹⁰)?

What is K_b for the conjugate base of HCN (K_a = 4.9 × 10^-10)?

Given that K_a for HIO is 3.2×10⁻¹¹ at 25 °C, what is the value of 𝐾_b for IO⁻ at 25 °C?

Given that a base has a K_b value of 8.36×10⁻⁴, what is the K_a of its conjugate acid?

Pick the stronger base from each pair. c. NO2– or NO3–

Pick the stronger base from each pair. a. ClO₄^– or ClO₂^– b. Cl^– or H₂O c. CN^– or ClO^–