1. A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4, fo

Question

1. 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 325 mL of a solution that has a concentration of Na+ ions of 1.50 M ?

2. A student placed 10.0 g of glucose (C6H12O6) in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100. mL mark on the neck of the flask was reached. The flask was then shaken until the solution was uniform. A 50.0 mLsample of this glucose solution was diluted to 0.500 L. How many grams of glucose are in 100. mLof the final solution?

Explanation / Answer

1) 1.5 = Moles / .325

= moles = 0.4875

Mass = 0.4875 * molecular weight of Na3PO4

2) In 50 ml of the solution taken we will have 5 gm of glucose

Than we dilute it to 500 ml

SO in 100 gram of this solution we will have = 1 gram

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