How many moles do you want? That's M x L = 0.2 x 0.500 =?
Then mols = grams/molar mass. You know mols and molar mass, solve for grams.
Weigh out that many grams, place in a 500 mL volumetric flask, swirl until all of the solid is dissolved, make to the mark with distilled water, shake thoroughly.
how would you prepare 500 ml of .2M solution starting with solid NaH2PO4*H20?
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