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f 5.0 cm\(^-3\) of 0.200 mol dm(^-3\) Na\(_2\)CO\(_3\) was diluted to 250cm(^-3\) solution, what would be the concentration of...

Chemistry
WAEC 2020

f 5.0 cm\(^-3\) of 0.200 mol dm(^-3\) Na\(_2\)CO\(_3\) was diluted to 250cm(^-3\) solution, what would be the concentration of the resulting solution?

  • A. 0.004 mol dm(^-3\)
  • B. 0.020 mol dm(^-3\)
  • C. 0.200 mol dm(^-3\)
  • D. 0.400 mol dm(^-3\)
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Correct Answer: Option A
Explanation

M_{1}V_{1}=M_{2}V_{2}

M_{1} = initial molarity
V_{1} = initial volume in liters
M_{2} = final molarity
V_{2} = final volume in liters

 

0.200 X 5.00 = M\(_2\) X 250

M\(_2\) = 1 / 250

M\(_2\) = 0.004 mol dm(^-3\)


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