Question

If 100.0 ml of HCI stock solution is used to make 500.0-ml of a 0.675 M HCI dilution, what is the molarity of the stock solution ?

Answer 1

3.375 M.

Step-by-step explanation:

• It is known that the no. of millimoles of HCl before dilution = the no. of millimoles of HCl after dilution.

∵ (MV) before dilution = (MV) after dilution.

∴ M before dilution = (MV) after dilution / V before dilution = (0.675 M)(500.0 mL)/(100.0 mL) = 3.375 M.