Practice question

Question

To a 10 × 10 ⁻⁹ 𝑀 solution of a receptor, its specific ligand was added, and incubated. At equilibrium, the concentration of the free ligand was 5 × 10 ⁻⁹ 𝑀, and the concentration of the receptor-ligand complex was 6 × 10 ⁻⁹ 𝑀. The dissociation constant for the receptor-ligand interaction is _________× 10 ⁻⁹ 𝑀 (rounded off to two decimal places). (NAT)