Dilution of Chemical Reactions

Question

A chemist must prepare 750.mL of 2.00M aqueous potassium iodide KI working solution. She'll do this by pouring out some 2.91molL aqueous potassium iodide stock solution into a graduated cylinder and diluting it with distilled water.

Calculate the volume in mL of the potassium iodide stock solution that the chemist should pour out. Be sure your answer has the correct number of significant digits.

Answer 1

(x ml)(2.91 M) = (750.0 ml)(2.00 M)

x = 515 mls stock soln needed (3 sig figs)