3 A weighed sample of 2.040 g was dissolved and thallium (I) was titrated potentiometrically with 0.1000 N. KBrO3 (feqv = 1/6) in hydrochloric acid medium:
BrO3- + 3TI+ + 6H+ ↔ Br + 3Tl3+ + 3H20
Construct titration curves in the coordinates E-V and ΔE / ΔV - V and calculate the mass fraction (%) of thallium in the alloy according to the following data:

V (KBrO3), ml ……… 2.00 10.00 17.00 18.80 19.00 19.20 21.00
E, mV ………………. 1250 1280 1310 1340 1410 1430 1450

Answer: 9.52%.

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