If 100. mL of water is added to 25 mL of 5.0 M NaCl, the final concentration is ________.
A)25 M
B)1.0 M
C)5.0 M
D)2.0 M
E)1.3 M

Question

Quizplus · Accepted Answer

To solve this problem, we need to use the equation:

M1V1 = M2V2

where M1 is the initial concentration, V1 is the initial volume, M2 is the final concentration, and V2 is the final volume.

Plugging in the values we have:

M1 = 5.0 M
V1 = 25 mL
V2 = 125 mL (25 mL + 100 mL)
M2 = ?

Now we can solve for M2:

M2 = (M1V1)/V2 = (5.0 M × 25 mL)/(125 mL) = 1.0 M

Therefore, the final concentration is 1.0 M, or choice B.

If 100 ML of Water Is Added to 25 ML of of 5.0