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Does anyone have any tips on determining dolomite percentage in a well-site setting? I was thinking that comparing the rate of effervescence in a 10% HCl in water solution could give some quantitative results. Maybe comparing the rate while changing parameters such as temperature of solution, strength of HCl solution or powdered vs solid sample. I could make a chart with the rate of known samples under these different conditions to compare to. I haven't tried this yet but what do you think? Any tips or better ideas? Thanks! To be clear I mean % dolomite in limestone/dolomite samples

Our project is an investigation into the treatment of antidepression in bipolar individuals using specific PCP analogs. There are some derivatives which have shown very promising results. Racemic seperation has shown to be a route to take to try and remove the adverse effects (confusion, ataxia, sensory distorsion, etc) that have prevented these derivatives from wide spread use. We are currently conducting this research in Mexico to avoid any legal hangups. Since the racemic mixtures we want to test aren't readily available we have decided to do the synthesis ourselves. However, our organic chemistry abilities are a little rusty. I understand this maybe outside the rules of your forum and I will gladly refrain from posting anymore about this sincerly apologize for any trouble.

The product is 1-bromocyclopentyl-(o-chlorophenyl)-ketone. The solvent is CCl4. I am supposed to evaporate the bromo-ketone to obtain a solid.

The procdure says that you evaporate to give the product, and that the product has a BP of 111-114 degrees C (0.1 mm Hg). It also says that the product is very unstable and that it must be used right away and that attempts to further distill it at 0.1 mm Hg wil decompose it. This sounds like I would have to be very carefull when I am evaporating. Any tips?

This is in response to my previous post on evaporating. The boiling point of this particular substance is stated in the procedure to be 111-114 degrees celcius. The solution did boil at this temperature and evaporated very quickly. Near the end of the evaporation the color changed from light yellow to black (final dried product was also black) and i'm not sure if this is a sign that I raised the temperature too high or if it is supposed to be black (The procedure dosn't say anything about color) If the BP is stated, is it a fair assumption that I can evaporate off the liquid at that temperature without having to worry about the substance decomposing?

The boiling point of this particular substance is stated in the procedure to be 111-114 degrees celcius. The solution did boil at this temperature and evaporated very quickly. Near the end of the evaporation the color changed from light yellow to black (final dried product was also black) and i'm not sure if this is a sign that I raised the temperature too high or if it is supposed to be black (The procedure dosn't say anything about color)

I am wondering generally how hot you can perform an evaporation of an organic substance dissolved in a solvent or other liquid. 1) Does one usually boil the liquid to evaporate it off or heat it only part of the way to boiling and wait? 2)Are there any tips/techniques anyone has for easy and efficient evaporation's? 3) I was assuming some substances will be altered by too much heat while trying to evaporate, is this a fair assumption?

Do you know if the term ether would mean Ethyl ether or diethyl ether?

If i'm using a magnetic stirrer bar can/should I use boiling chips as well for maximum safety and efficiency?

One of the steps in an experiment I have to do is recrystallization from pentane-ether. Does this mean I have to dissolve the product in a mixture of hot pentane and ether mixed together, filter , and then let the solution cool slowly to crystallize out the product? Or does this mean I can use either pentane or ether? Assuming I use a mixture of the two, does 50/50 mixture of the two make sense?

Would you go with the sand because it is safer to work with than a beaker full of very hot oil?

I want to setup a simple reflux reaction where I need to heat a RBF to ~180 degrees celcius. What is the safest/most efficient way to do this? Silicone oil can't go hot enough to be used in a double boiler type setup. Would a double boiler setup with sand be a good method? Thanks for the help!