Which of the following solutions has a concentration of 0.10 M? a. 518.8 mg potassium iodide dissolved in 3.125 mL water b. 415 mg potassium iodide dissolved in 2500 mL water c. 103.8 mg potassium iodide dissolved in 6.25 mL water d. 2.075 g potassium iodide dissolved in 1.25 L water