Answer to Question #65129 in Chemistry for Harleen Brar

Question

For the following analytical scenario below which involved initially diluting 20 ml of the original water sample into a 1000 ml volumetric flask. Subsequently, the sample was prepared and analyzed as depicted below:

Volumetric Flask (500 ml) #1
Sample Composition: 5 ml of sample + 0 mL of 300 ppm Na 0.5% LiCl2
Absorbance: 0.12

Volumetric Flask (500 ml) #2
Sample Composition: 5 ml of sample + 1 ml of 300 ppm Na + 0.5% LiCl2
Absorbance: 0.17

Volumetric Flask (500 ml) #3
Sample Composition: 5 ml sample + 2 ml of 300 ppm Na + 0.5% LiCl2
Absorbance: 0.21


I. If all the flasks were diluted to a final volume of 500 ml with distilled water calculate the final
concentration of sodium in the sample through a graphical and mathematical solution. (10 pts)

II. Why Lanthanum and Cesium or Lithium are added to solutions to be analysed for Calcium and
Sodium respectively? (6pts)

Answer 1

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