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 AlCl3is 1 M in Al3+ and 3 M in Cl. 1 M of (NH4)2SO4 is 2 M in NH4+ and 1 M in SO42.

Part A. What is the concentration of K+ in 0.15 M of K2S?

Part B.

If CaCl2 is dissolved in water, what can be said about the concentration of the Ca2+ ion?

If  is dissolved in water, what can be said about the concentration of the  ion?

Part C. 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 250. mL of a solution that has a concentration of Na+ ions of 0.600 M ?

It has the same concentration as the Cl ion. Its concentration is half that of the Cl ion. Its concentration is twice that of the Cl ion. Its concentration is one-third that of the Cl ion.

Explanation / Answer

A) The concentration of K+ in 0.15 M of K2S = 0.30 M

B) If CaCl2 is dissolved in water, then the concentration of the Ca2+ ion = Its concentration is half that of the Cl ion.

C) 0.2 = [(mass/ 164)X (1000/250)] (If Na+ ions = 0.600 M then the concentration of Na3PO4 = 0.2 M)

      mass = (0.2 X 164 X 250)/100

               = 8.2 grams

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