Magnesium is a valuable, light weight used as a structural mataerial as well as in a alloys batteries and in chemical synthesis. Although magnesium is plentiful in earth.s crust, it is mainly found in sea water (after sodium). There about 1.3 g of magnesium in every kilogram of sea water. The process for obtaining magnesium from sea water employs all three types of reactions, i.e. precipitation acid-base and redox reactions
Preipitation reaction involves formation of

Options

A. insouble `MgCO_(3)` by adding `Na_(2)CO_(3)`
B. insouble `Mg(OH)_(2)` by adding `Ca(OH)_(2)`
C. insouble in `MgSO_(4)` by adding `Na_(2)SO_(4)`
D. insouble `MgCI_(2)` By adding NaCI

Answer

B

Explanation

By the addition of `Ca(OH)_(2)` which is strong base to `Mg(OH)_(2) , its ionic proiduct (Kip) increases than the solubility product (Ksp) and precipitation takes place