Question

Hydrochloric acid is usually purchased in a concentration of 37.0% HCL by mass and has a density of 1.20 g/ml. What volume of concentrate HCL is required to prepare 2.0L of 0.500M HCL. Also in a few complete sentences please describe exactly how you would prepare this diluted solution using common laboratory glassware. Write this as you are writing a lab procedure.

Answer 1

molarity of HCl initially = mass %   x density x 10 / molar mass

                                    = 37 x 1.20 x 10 / 36.5

                                    = 12.16 M

C1 = 12.16 M

C2 = 0.500 M

V2 = 2.0 L

V1 = ?

C1 V1 = C2 V2

12.16 x V1 = 0.500 x 2.0

V1 = 0.0822 L

volume of concentrated solution needed = 0.0822 L