14) For a given Na HPO solution, the phosphate content is precipitated with Mg(II) in the presence of aqueous NH3. The precipitate is filtered and ignated before weighing. If the weight is 0.555 g, find the gram amount of Na HPO, in the original sample (Mg,P,0,: 222, Na: 23, H: 1, P: 31, 0:16)