EllaWhils01Lv1

14 May 2022

Use the following information to answer the next three questions.

Iodometry is a method of volumetric chemical analysis, a titration where the appearance or disappearance of elementary iodine  indicates the end point. A student preformed an iodometry titration with sodium thiosulfate as titrant, starch as an indicator (it forms blue complex with iodine molecules) and iodine compound. The balanced reaction is:

 

 

 

Amount of 0.125 Thiosulfate \left used to titrate 10.00 mL of  

 

Trial	I	II	III
Final burette volume mL	27.3	44.5	30.1
Initial burette volume mL	10.1	27.4	12.8
Volume of titrant added mL

 

10. Which species is reduced?

A.  

B.  

C.  

D.  

 

11. Using the balanced reaction and the titration data above, determine the concentration of the   in the sample.

A. 0.0363  

B. 0.108

C. 0.145

D. 0.430