The solubility product values of barium sulphate and barium carbonate are 1.0 × 10^–10 and 5.0 × 10^–9 respectively When the two salts are simultaneously equilibrated in pure water the ratio of $\frac{\left[{\text{SO}}_{\text{4}}^{\text{2}-}\right]}{\left[{\text{CO}}_{\text{3}}^{\text{2}-}\right]}$ is