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What volume of a solution of sodium hydrogen phosphate, containing 90 grams of Na HPO .12H O per liter, would be required to precipitate the zinc as ZnNH PO and what weight of precipitate would be obtained? A sample of magnesium carbonate, contaminated with SiO as its only impurity, weighs 0.5000 gram and loses 0.1000 gram on ignition. !Answer!: 9.07 cc.
On standing it becomes crystalline and then has the composition ZnNH PO . The precipitate then settles rapidly and is apt to occasion "bumping" if the solution is heated to boiling. An error from this source may be avoided by determining the weight of the crucible and filter after weighing the precipitate.
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