Ion concentration refers to the molar concentration of an ion in solution. It ma

Question

Ion concentration refers to the molar concentration of an ion in solution. It may be identical to, or greater or less than, the molar concentration of the compound containing the ion that was used to make the solution.

For soluble salts, the molarity of a particular ion is equal to the molarity of that compound times the subscript for that ion. For example, 1 M of AlCl3 is 1 M in Al3+and 3 M in Cl. 1 M of (NH4)2SO4 is 2 M in NH4+ and 1 M in SO42.

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 675 mL of a solution that has a concentration of Na+ ions of 0.900 M ?

Explanation / Answer

1 mole of Na3PO4 has 3 moles of Na+ ion

So, for 0.9 M Na+ e have to prepare a 0.3 M solution

grams of Na3PO4 required = 0.3 M x 163.94 g/mol x 0.675 L = 33.20 g

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