Question

What is the concentration of a solution made by diluting 1.00 mL of concentrated HCl (12.1 M) to 100.0 mL?

A)

0.116 M

B)

0.242 M

C)

0.121 M

D)

0.0605 M

E)

0.100 M

Answer 1

use dilution formula

M1*V1 = M2*V2

Here:

M1 is molarity of solution before dilution

M2 is molarity of solution after dilution

V1 is volume of solution before dilution

V2 is volume of solution after dilution

we have:

M1 = 12.1 M

V1 = 1.0 mL

V2 = 100.0 mL

we have below equation to be used:

M1*V1 = M2*V2

M2 = (M1*V1)/V2

M2 = (12.1*1)/100

M2 = 0.121 M

Answer: C