Calculate %NH3 in Complex by Titration: How-To Guide

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SUMMARY

The discussion focuses on calculating the percentage of ammonia (%NH3) in a complex formed by the reaction of CuSO4·5H2O, water, ammonia, ethanol, and acetone through titration. The user successfully performed the experiment but requires assistance with the calculation. The complex is identified as tetrammine copper(II) sulfate, [Cu(NH3)4]SO4·H2O, and the titration utilized 31.05 mL of standardized 0.1M HCl to analyze 0.2g of the complex dissolved in 25 mL of water.

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  • Understanding of titration techniques and calculations
  • Knowledge of molarity and its application in chemical reactions
  • Familiarity with the chemical composition of tetrammine copper(II) sulfate
  • Basic skills in stoichiometry for calculating mass percentages
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  • Research the calculation of mass percentage in chemical compounds
  • Learn about titration calculations and how to determine equivalence points
  • Study the properties and reactions of ammonia in coordination complexes
  • Explore the preparation and crystallization of tetrammine copper(II) sulfate
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Percentage of NH3?

Recently I've done an experiment and we are required to determine the percentage NH3 in the complex by mass.

I had no problem doing the experiment but stuck in the calculation part

Really hope someone can help me here! >.<

The experiment was done by titration, the complex we used is... (CuSO4*5H2O + H2O + NH3 + ethanol + acetone) - sorry I don't know how I should call this @.@ But those are the things we used to make that complex...

First I dissolved 0.2g of the complex with 25mL H2O, & 31.05mL of standardized 0.1M HCl was used to titrate it. Then we are required to find "%NH3"...

Can someone please kindly tell me (at least the formula that I need to use) to calculate the percentage NH3? :'(

Thanks so much! :shy:
 
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My best guess is that your complex is tetrammine copper(II) sulfate - [Cu(NH3)4]SO4.H2O

Was it deep blue in color? Did you have to make the crystals by evaporation?
 

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