6. Solution to Chemistry Problem

6. Solution to Chemistry Problem

9. 1.00 ml of the test solution, zinc salt containing 0.238 mg of the 65Zn isotope, and different volumes (from 0.20 to 1.60 ml) of 0.0287 N K4Fe(CN)6 (feq=1/3) were added to the beaker for radiometric titration. After adding each portion of the titrant and mixing, a sample of the filtrate was taken, the activity was measured, and the sample was returned to the beaker. The obtained results are presented in the table:
V(K4Fe(CN)6) 0.20 0.40 0.60 0.80 1.0 1.20 1.40 1.60
A, cpm for variant 1 950 820 680 570 420 280 150 0
A, cpm for variant 2 1030 910 800 680 550 440 330 200
A, cpm for variant 2 930 720 520 310 100 0 0 0
Plot a titration curve and calculate the zinc concentration in the solution (mg/ml), if the activity of the solution before the titration was 1150 cpm.
Solution for variant 1

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