Finding percentage of NH3 in a copper ammonia complex by titration

[kaitoufion]

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:

 

[Gokul43201]

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?