If 5.0cm‾³ of 0.200 mol dm‾³ Na2CO3 was diluted to 250cm‾³ solution; what would be the concentration of the resulting solution?

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A. 0.004 mol dm‾³
B. 0.020 mol dm‾³
C. 0.200 mol dm‾³
D. 0.400 mol dm‾³

Correct Answer:

Option A = 0.004 mol dm‾³

Explanation

M1V1 =M2V2

M1 = initial molarity
V1 = initial volume in liters
M2 = final molarity
V2 = final volume in liters

0.200 X 5.00 = M2 X 250

M2 = 1/250

M2 = 0.004 moldm-3

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