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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Acid Base Titration

An acid-base titration is the method of quantitative analysis for determining the concentration of an acid and base by exactly neutralizing it with a standard solution of base or acid having known concentration.