Quantitative Chemical Analysis
Quantitative Chemical Analysis
9th Edition
ISBN: 9781464135385
Author: Daniel C. Harris
Publisher: W. H. Freeman
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Chapter 25, Problem 25.AE
Interpretation Introduction

Interpretation:

The concentration of A in the unknown solution has to be calculated.

Expert Solution & Answer
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Answer to Problem 25.AE

The concentration of A is 0.418mg/mL .

Explanation of Solution

Peak area of A is 5.97 .

Peak area of B is 6.38 .

AreaA[A] = F(AreaB[B])10.86[1.03] = F(4.37[1.16])F = 10.86[1.03]×[1.16]4.37 = 12.59764.5011 = 2.789 = 2.79

Total volume of the unknown solution is given as 25.00mL .

Weight of B added is 12.49g .

Total volume of A added is 10mL .

Concentration of B in the unknown solution can be found as shown below,

12.49g/25.00mL = 0.4996g/mL

The concentration of A can be found as shown below,

AreaA[A] = F(AreaB[B])5.97[A] = 2.79(6.38[0.4996])[A] = 5.972.79×[0.4996]6.38 = 2.98261217.8002 = 0.1675g/mL

The concentration of A in original unknown solution is found as,

[A]in original unknown = 25.0010.00(0.167mg/mL) = 0.418mg/mL

Therefore, the concentration of A in the unknown is found as 0.418mg/mL .

Conclusion

The Concentration of A in the unknown was calculated as 0.418mg/mL .

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