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EllaWhils01Lv1
16 May 2022
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 
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
1. 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
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:
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 used to titrate 10.00 mL of
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 |
1. Using the balanced reaction and the titration data above, determine the concentration of the in the sample.
in the sample.A. 0.0363
B. 0.108
C. 0.145
D. 0.430
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16 May 2022
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Related questions
White phosphorus, 
(s) is a white, waxy crystalline solid that reacts spontaneously and violently when exposed to air. White phosphorus is thus stored under water in order to prevent spontaneous oxidation from occurring.
In order to determine the enthalpy of combustion of white phosphorus, 3.56 g of pure (s) was placed in a bomb calorimeter. The following data was obtained:
| overall mass of calorimeter | 1.000 kg |
| overall specific heat capacity of calorimeter | 2.397 J/g |
| initial temperature | 23.31 |
| final temperature | 38.92 |
Written Response #3
a) Determine the moral enthalpy of combustion of white phosphorus
