An environemtal aqeous samples has 515 g/mL of Gallium (III) ion and 323 g/mL of Mecury (II) ion, NaOH solution is slowly dropped into the sample. (a) Determine which metal ion would precipitate first? Show your reasoning, including the calculations involved. Given that Ksp for Hg(OH)2 and Ga(OH)3 are 3.6x10-28 and 7.28x10-36 respectively. (b) Comment if complete separation of Hg2+ and Ga+ is feasible by this fractional precipitation. Explain your answer.