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1. I did an expertiment, where I recrystalised an isomer from a the filtrate of another isomer, and I need to calculate the % yeild.

I think the balanced eq is:

[l-Co(en)3]3+ + 3NaI + H2O + tartrate = [l-Co(en)3]I3.H2O + 3Natart

We also added some conc. ammonia, but I'm not sure what the role of that was.

Anyway, since the l-Co(en)3]3+ was in a filtrate, I don't know how many grams were added. Do I use the NaI instead, or is there a trick I'm missing?
2. (Original post by fudgestix)
I did an expertiment, where I recrystalised an isomer from a the filtrate of another isomer, and I need to calculate the % yeild.

I think the balanced eq is:

[l-Co(en)3]3+ + 3NaI + H2O + tartrate = [l-Co(en)3]I3.H2O + 3Natart

We also added some conc. ammonia, but I'm not sure what the role of that was.

Anyway, since the l-Co(en)3]3+ was in a filtrate, I don't know how many grams were added. Do I use the NaI instead, or is there a trick I'm missing?
Did you have tartaric acid, in which case you might neutralise with ammonia?

You certainly could calculate a yield based on iodide and, indeed, unless you can get at the starting quantity of Co complex somehow, I don't see any other way of doing the calculation.

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Updated: November 30, 2010
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