Chemistry - Complete s-block Question with Solution | TestHub

A sample of ${\mathrm{MgCO}}_3$ is dissolved in dil. $\mathrm{HCl}$ and the solution is neutralized with ammonia and buffered with $\mathrm{NH}{\mathrm{Cl}}_4/$ ${\mathrm{NH}}_4\mathrm{OH}$. Disodium hydrogen phosphate reagent is added to the resulting solution. A white precipitate is formed. What is the formula of the precipitate?