NaBr cells

[akimhaneul]

There is a question in dat odyssey that asks whether ethanol is a good solvent for IR spec or not. The correct answer is "No, a polar solvent will dissolve NaBr cells"

I was thinking more along the lines of ethanol having dipole and this dipole getting in the way of measuring the dipole of the substance we are studying.

What does NaBr have to do with anything?




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[akimhaneul]

It's number 39 in chapter 9 of organic odyssey

 

[DAT Destroyer]

There is a question in dat odyssey that asks whether ethanol is a good solvent for IR spec or not. The correct answer is "No, a polar solvent will dissolve NaBr cells"

I was thinking more along the lines of ethanol having dipole and this dipole getting in the way of measuring the dipole of the substance we are studying.

What does NaBr have to do with anything?




Sent from my iPhone using SDN mobile

Cells for IR analysis are usually made of NaCl , NaBr, or KBr. For liquid samples, the common procedure is to place a drop of the liquid between two salt plates. These salts will dissolve in solvents that are polar such as water or alcohol.In Grad school this is often an embarrassing error because the cells ( wafer looking substances ) are very EXPENSIVE !!!! Solvents like water, methanol, ethanol, propanol, even DMSO should NOT be used. The most common solvents are CHCl3, CS2, and CCL4. If you go to You Tube, you will find a few clips of a student or professor using this wafer.

Hope this helps.

Dr. Romano