Answer to Question #154589 in General Chemistry for Dominguez

Question #154589

Prepare a 2 liter 50mM sodium phosphate stock solution using mono sodium phosphate monohydrate (FW 137.990)


1
Expert's answer
2021-01-11T05:03:42-0500

Find how many moles of the solute the solution contains:


"n=VM=2\\cdot0.05=0.1\\text{ mol}."

The mass of mono sodium phosphate monohydrate with formula weight of 137.990 required to prepare this solution is


"m=n\\Mu=0.1\\cdot137.99=13.799\\text{ g}."


Thus, to prepare this solution, we need 13.799 g of mono sodium phosphate monohydrate (dry) and 2 L of water.


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