Question

The concentration of iodide ions in a 0.193 M solution of barium iodide is ________.

0.386 M
0.193 M
0.0965 M
0.579 M
0.0643 M

Answer 1

The concentration of iodide ions in a 0.193 M solution of barium iodide is 0.386 M because each unit of BaI₂ produces two I- ions upon dissociation in water. The correct answer is option: 0.386 M

Step-by-step explanation:

The concentration of iodide ions in a 0.193 M solution of barium iodide is 0.386 M. This is because barium iodide (BaI₂) dissociates into one barium ion (Ba²⁺) and two iodide ions (I-) for each formula unit that dissolves in water.

Therefore, for every mole of BaI₂ that dissolves, there are two moles of I- ions produced.

So, if the concentration of BaI₂ is 0.193 M, then the concentration of I- ions will be twice that because of the 1:2 ratio. Hence, the correct answer is 0.386 M for the iodide ion concentration.