PCP, a dissociative hallucinogenic drug, will form crystals that look like branching needles when it reacts with potassium iodide solution in a rapid test. What concentration (in M) should the stock solution be if the procedure calls for 35.0mL of stock KI solution to be diluted to 150.0mL for a 0.750M KI solution?
2.46 M
3.96 M
0.175 M
3.21 M