What volume (mL)of a concentrated solution of magnesium chloride (9.00 M)must be diluted to 350.mL to make a 2.75 M solution of magnesium chloride?
A)14.1
B)1.15
C)127
D)107
E)38.8

Question

Quizplus · Accepted Answer

We can use the formula:
M1V1 = M2V2

where,
M1 = concentration of concentrated solution of MgCl2 = 9.00 M
V1 = volume of concentrated solution
M2 = desired concentration of MgCl2 = 2.75 M
V2 = final volume of diluted solution = 350 mL

Substituting the values in the formula, we get:

9.00 V1 = 2.75 x 350
V1 = (2.75 x 350)/9.00
V1 = 107.64 mL

Therefore, the volume of concentrated solution that needs to be diluted is 107.64 mL, which is closest to choice D, 107 mL.

What Volume (ML)of a Concentrated Solution of Magnesium Chloride (9