Recent content by pyridine

hey Char Limit, I can't find one on the internet anywhere and I don't have a scanner :(

Homework Statement OK. So I've been given a uni lab report to write up but we were only told yesterday how to read proton NMR, and it's due in on Monday. I'm not terrible at deciphering it, but the compound I've been given the NMR for doesn't make sense (to me). I have to look at the proton...

2 equations, 2 unknowns..of course. Thanks!

Awright... I've inched further forward. I know the total concentration and the total absorbance. The total absorbance is made up of x concentration of base and y concentration of acid. What would be a way to work out the ratio of acid/base, if you know the absorbance of a purely acid sample as...

Symbolipoint: Even if you scan an acid wavelength and a basic wavelength like you said, if the wavelengths overlap, all of the absorption wouldn't be related to a single form. Do you think that'd matter? Borek: You'd know the sum of the concentrations of both, it's just the total concentration...

Homework Statement OK, so if your indicator has 2 clearly different wavelengths of absorption for acidic and basic forms, you can measure the absorbance of buffered samples at a wavelength which only absorbs, for instance, the acidic form. Then you can use beer's law to find the concentration...

Yep, the product is tri iodide...i just put the superscript in the wrong place... It's complex because I can't find the standard enthalpy of formation of iodine in the aqueous state, or the standard enthalpy of formation of tri iodide.

Homework Statement OK. so i have a separation science lab report write up to do which involves the equilibrium of the tri-iodide ion dissociating into iodine and iodide. I know the concentrations at room temperature (which is very cold, about 10 degrees C, where i come from!), and thus the...