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A 0.7785 g sample containing hydrazine (N2H4, rocket fuel) was dissolved and diluted to 250.0 mL in a volumetric flask.  A 25.00 mL aliquot was treated with 50.00 mL of 0.0313 M KBrO3, which reacts with hydrazine as follows: 2KBrO3 + 3N2H4 ---> 2 KBr(aq) +3 N2(g) +6H2O   The solution was then acidified after adding additional Br-, which converted the excess BrO3- to Br2.   BrO3- + 5Br- + 6H+ -----> 3Br2 + 3H2O   The bromine was then reacted with excess I-.   Br2 + 3I- -----> I3- + 2Br-   The liberated I3- was then titrated with 0.1115 M thiosulfate, HS2O32-, requiring 10.76 mL to reach and endpoint.  Calculate the weight percent hydrazine in the sample.   I3- +  2HS2O3- _---> 3I- + 2H+ +  S4O62-

A 0.7785 g sample containing hydrazine (N2H4, rocket fuel) was dissolved and diluted to 250.0 mL in a volumetric flask.  A 25.00 mL aliquot was treated with 50.00 mL of 0.0313 M KBrO3, which reacts with hydrazine as follows: 2KBrO3 + 3N2H4 ---> 2 KBr(aq) +3 N2(g) +6H2O   The solution was then acidified after adding additional Br-, which converted the excess BrO3- to Br2.   BrO3- + 5Br- + 6H+ -----> 3Br2 + 3H2O   The bromine was then reacted with excess I-.   Br2 + 3I- -----> I3- + 2Br-   The liberated I3- was then titrated with 0.1115 M thiosulfate, HS2O32-, requiring 10.76 mL to reach and endpoint.  Calculate the weight percent hydrazine in the sample.   I3- +  2HS2O3- _---> 3I- + 2H+ +  S4O62-

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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A 0.7785 g sample containing hydrazine (N2H4, rocket fuel) was dissolved and diluted to 250.0 mL in a volumetric flask.  A 25.00 mL aliquot was treated with 50.00 mL of 0.0313 M KBrO3, which reacts with hydrazine as follows:

2KBrO3 + 3N2H4 ---> 2 KBr(aq) +3 N2(g) +6H2O

 

The solution was then acidified after adding additional Br-, which converted the excess BrO3- to Br2.

 

BrO3- + 5Br- + 6H+ -----> 3Br2 + 3H2O

 

The bromine was then reacted with excess I-.

 

Br2 + 3I- -----> I3- + 2Br-

 

The liberated I3- was then titrated with 0.1115 M thiosulfate, HS2O32-, requiring 10.76 mL to reach and endpoint.  Calculate the weight percent hydrazine in the sample.

 

I3- +  2HS2O3- _---> 3I- + 2H+ +  S4O62-

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