In each of the following pairs, indicate which has the higher concentration of I- ions:
a. 0.10 M of BaI2 or 0.25 M KI solution
b. 100 mL of 0.10 M KI solution or 200 mL of 0.040 M of ZnI2 solution?
c. 3.2 M HI solution or a solution made by dissolving 145 g of NaI in water to make a 150 mL solution?
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a. The 0.25 M KI solution has a higher concentration of I- ions. This is because KI dissociates completely in water, whereas BaI2 only partially dissociates.
b. The 200 mL of 0.040 M ZnI2 solution has a higher concentration of I- ions. This is because the concentration is given in terms of moles per liter, so regardless of the volume, the concentration remains the same.
c. The solution made by dissolving 145 g of NaI in water to make a 150 mL solution has a higher concentration of I- ions. This is because the concentration is determined by the amount of solute dissolved in a given volume of solvent.
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