Atmospheric acid leaching in agitated vessels is a preferred processing method for low grade nickel

laterite ore found in Australia. $N{i}^{2+}$ can be selectively recovered from $C{o}^{2+}$ by reduction using hydrogen

gas at $10$atm and $25C.$ If an acid leach solution contains $15\frac{g}{L}N{i}^{2+}$ and $0\mathrm{.}5\frac{g}{L}C{o}^{2+},$ calculate the

maximum $\%$ recovery of nickel containing no more than $0\mathrm{.}01\%$ cobalt and calculate the desired $pH$ to

yield this recovery and selectivity.