Chemistry
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A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4, for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 650. mL of a solution that has a concentration of Na+ ions of 1.20 M ?

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Cesiacaylen

Na₃PO₄ -----> 3Na(+) + PO₄(3-) y-y.......................3y...........y 3y = 1.2 y = 0,4M Na₃PO₄ -----> 3Na(+) + PO₄(3-) 0,4-0,4..............1,2..........0,4 0.........................1,2..........0,4 C = n/V n = C×V n = 0,4×0,65L n = 0,26 mol Na₃PO₄ mNa₃PO₄: (23×3)+31+(16×4) = 164 g/mol 164g ----- 1 mol Xg -------- 0,26 mol X = 164×0,26 X = 42,64g Na₂SO₄

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