how much concentrated 12 M hydrochloric acid is needed to prepare 100 mL of a 2.0 M solution?

16.67ml

c1v1 = c2v2

c = concn
v = volume

600

To determine the amount of concentrated 12 M hydrochloric acid needed to prepare 100 mL of a 2.0 M solution, we can use the formula:

C1V1 = C2V2

Where:
C1 = initial concentration (12 M)
V1 = initial volume (unknown)
C2 = final concentration (2.0 M)
V2 = final volume (100 mL)

To find V1, let's substitute the given values into the equation:

(12 M) * V1 = (2.0 M) * (100 mL)

Now, we can solve for V1:

V1 = (2.0 M * 100 mL) / 12 M

V1 = 16.7 mL (rounded to one decimal place)

Therefore, approximately 16.7 mL of concentrated 12 M hydrochloric acid is needed to prepare 100 mL of a 2.0 M solution.