Concentrated hydrochloric acid is sold as a 12.1 M solution. What volume of this solution of concentrated HCl is needed to prepare 0.500 L of 0.250 M HCl?

Strategy

We know the volume and the concentration of the dilute solution; this information is used to calculate the number of moles of HCl needed to prepare the dilute solution. Because the source of the HCl is the concentrated solution (conc), we can calculate the volume required to add this needed amount of HCl using the molarity of the concentrated solution.

Transcribed Image Text:

Volume (L) of dilute HCI solution Molarity of dilute HCI solution Moles of HCI Molarity of concentrated HCl solution Volume (L) of concentrated HCI solution