Analytical chemistry

Order instructions

(a)     A solution of sodium was prepared by dissolving 0.0UVW g of NaCl in distilled deionized water and brought up to the mark in a 200 mL volumetric flask. 10.0 mL of this solution was diluted to 250.0  mL. What is the concentration (ppm) of sodium the final solution?

 

(b)     What mass of  Pb(NO3) 2(mg) is required to prepare 250 mL of an aqueous solution which is to be UYZ ppm Pb?

 

(c)     The solution of KMnO4 was prepared by taking 5.00 mL of Stock #1 and diluting it to 100.0 mL to make Stock #2.  5.0 mL of Stock #2 was diluted to 25.0 mL to make the final solution which is analyzed by visible spectroscopy and found to have a concentration of X.WY ppm based on a calibration curve generated using standards.   What was the concentration of KMnO4 in Stock #1 (ppm)?

 

(d)    What is the concentration of  Mn (ppm) of Stock #1 from part (c)?

 

(e)     What is the molar concentration of KMnO4 of Stock #1 from part (c)?

 

 

ANSWERS for Question 2:

(Use correct units/sig.fig.; make a note, or correct, if any unit given below is wrong)

 

(a)  _______________ ppm                      (b)        _______________ mg NaCl

 

(c)  _______________ ppm KMnO 4        (d)       _______________ ppm Mn

 

(e)  _______________ mol L -1KMnO 4    (f)        _______________ ppm NaCl

Answers

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