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

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To calculate the percentage of NH3 in the complex, first determine the moles of HCl used in the titration, which is calculated using the formula: moles = concentration (mol/L) × volume (L). Since the reaction between NH3 and HCl is a 1:1 ratio, the moles of NH3 will equal the moles of HCl. Next, calculate the mass of NH3 using its molar mass (17.03 g/mol) and then find the percentage by dividing the mass of NH3 by the mass of the complex and multiplying by 100. The complex in question is likely tetrammine copper(II) sulfate, which may have been deep blue in color. This method will yield the desired percentage of NH3 in the complex.
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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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