User:Douglas M. Fox/Notebook/AU CHEM-571 F2011 Lab Support/2014/10/08: Difference between revisions
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== | ==[I<sup>-1</sup>] by Precipitation Titration== | ||
* | * Prepare 25 - 30 mL 50 mM KI Stock Solution (store in 50 mL Falcon tube) | ||
* Prepare 50 mL 75 mM AgNO<sub>3</sub> Solution | |||
**Be very precise with your measurements (use Rm 205 balance) | |||
**Use volumetric flask | |||
** Store in Black 50 mL Falcon tube | |||
*Prepare 100 mL 10 mM NH4SCN Stock Solution (store in Falcon tubes) | |||
*NH4SCN Standardization | |||
*#Add 3 mL 1 M HNO<sub>3</sub> and 2 mL AgNO<sub>3</sub> to 10 mL DI H<sub>2</sub>O | |||
*#Add 200 μL Ferric alum indicator | |||
*#Titrate with your NH4SCN solution | |||
*#Your solution should turn red around 15 mL | |||
*KI Standardization | |||
*#Add 3 mL 1 M HNO<sub>3</sub> and 1 mL KI to 10 mL DI H<sub>2</sub>O | |||
*#Add 2 mL AgNO<sub>3</sub> and swirl to complete precipiatation | |||
*#Add 200 μL Ferric alum indicator | |||
*#Titrate with your NH4SCN solution | |||
*#Your solution should turn red around 10 mL | |||
*[I<sup>-1</sup>] for dialysis | |||
**'''Follow the same procedure as your KI standardization''' | |||
**Note that your limit of detection will be based on how small a volume you can read (0.1 mL = 1 mM LOD) | |||
**You may want to try a new NH4SCN solution (more dilute) for smaller concentrations. | |||
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Revision as of 15:45, 7 October 2014
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[I-1] by Precipitation Titration
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