Question

The volume of 7.91 M HCl needed to make 196.1 mL of 2.13 M HCl is ____.

Select one:
a. 52.8
b. 728
c. 0.198
d. 3490

Answer 1

a) 52.8

Step-by-step explanation:

M1V1 = M2V2

(7.91 M)(x ml) = (2.13 M) (196.1 ml)

(7.91M) (xml) = 417.693 M.ml

x ml = 417.693/ 7.91

x = 52.8

Answer 2

A. 52.8

Step-by-step explanation:

We make use of the dilution formula to solve this

`M_1* V_1 =M_2* V_2`

Where (
`M_1` and
`M_2` are the initial molarity and final molarity and
`V_1` and
`V_2` are the initial volume and final volume)

Plugging into the values in the formula

`M_1* V_1 =M_2* V_2`

`7.91M * V_1=2.13M * 196.1mL`

`V_1=\frac {(2.13M * 196.1mL)}{7.91M}`

= 52.8 mL is the Answer