Titration of thiosulphate with KIO3, molarity? PLEASE HELP

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SUMMARY

The discussion centers on the iodometric titration of copper in brass using thiosulphate (Na2S2O3) and potassium iodate (KIO3). The user prepared a thiosulphate solution by dissolving 12.5002 g of Na2S2O3·5H2O in 500 mL of water, aiming for a molarity of approximately 0.1 M. They also prepared a 0.02 M KIO3 solution by dissolving 2.1400 g in 500 mL of water. The user sought assistance in calculating the exact molarity of their thiosulphate solution to complete their lab report.

PREREQUISITES
  • Understanding of iodometric titration principles
  • Knowledge of molarity calculations
  • Familiarity with the chemical reactions involved in titration
  • Basic laboratory skills for preparing solutions
NEXT STEPS
  • Calculate the molarity of Na2S2O3 using the mass and volume of the solution
  • Review the stoichiometry of the reaction between Na2S2O3 and KIO3
  • Study the role of KI and HNO3 in the iodometric titration process
  • Explore resources on titration techniques and calculations for accuracy
USEFUL FOR

Chemistry students, laboratory technicians, and educators involved in analytical chemistry and titration methodologies will benefit from this discussion.

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Homework Statement



I am so confused.

I am doing a "Iodometric Titration of Copper in Brass" lab.

We first made a thiosulphate solution by mixing 500 mL water, 12.5 g of Na2S203 * 5H20, and .05 g Na2CO3. This solution is "supposed" to come out to be about 0.1 M. My actual measurements were about 12.5002 g of Na2S2O3*5H20 and .0502 g Na2CO3.



We then made an approximately 0.02M KI03 solution where I mixed 2.1400g KIO3 dissolved in water to 500mL.

We then added 25.00 mL of this KIO3 solution to a flask, as well as 1mL concentrated HNO3 and 1g of KI. Then we titrated this with our Na2S2O3 solution.

I need to figure out the molarity of my Na2S2O3 (thiosulphate) solution, but I don't know how.

Someone please help my lab report is due tomorrow and I don't even know where to start and I'm starting to panic. :(


I can't do the rest of my report until I can figure this out.



Homework Equations





The Attempt at a Solution

 
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Yes! I didn't know these equations and my google searches were not helping me at all. This definitely clears up a lot!

Thank you! crisis averted! :)
 

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