if 65.5 mL of HCI stock solution is used to make 450 mL of a 0.675 M HCI dilution, what is the molarity of the stock solution?
To find the molarity of the stock solution (C1), we can use the formula:
C1V1 = C2V2
Where:
C1 is the molarity of the stock solution (to be solved)
V1 is the volume of the stock solution used (65.5 mL)
C2 is the molarity of the dilution (0.675 M)
V2 is the final volume of the dilution (450 mL)
Plugging in the known values:
C1 * 65.5 mL = (0.675 M) * 450 mL
C1 * 65.5 = 303.75
C1 = 303.75 / 65.5
C1 ≈ 4.64 M
Therefore, the molarity of the stock solution is approximately 4.64 M.