Recent content by tipton12

I only assumed that if the bp of the solvent was higher thanthe mp of the solute than the compound you're trying to isolate will have already melted and mixed completely with the solvent.

Ok, you're right dextercioby. I had it the other way around. Oops! But I still am not clear on the reasoning. Here is the website I read it from: http://www.ux1.eiu.edu/%7Ecfthb/classes/2445/2003/Quiz2key.htm

does anyone know why it is important to have the melting point of a solute not be higher than the boiling point of the solvent during recrystallization? --having a little trouble rationalizing this.

i don't know why my answer posted that way, but the =O is supposed to be on the Carbon attached to the -OH.

sorry i never got back to writing my answer. I waited for it to be graded. This is what I did and it was marked correct: K ____H2/Pt___K ____Oxidized___KMnO4/heat___ 3-hexene___H2/Pt___hexane w/carbocation on the 3carbon_____warm KMnO4/-OH___>> HO-C-CH2-CH3...

Alright, this one is from my analytical chem. class and right now we're doing separations and all the calculations related (partition coefficients, etc.). Anyway, I'm having trouble with this one. It seems easy, but let me know what you think a good starting point would be... What total...

I'll play around with both ideas and get back to you on my answers. Thank you both for all your help!

Having trouble with this one; I've tried working backwards from the three carbon carboxylic acid product, but to no avail. Please help! I can not figure out 'K'. "A hydrocarbon K adds one equivalent of H2 upon hydrogenation over a Pt catalyst. When K is oxidized vigorously with hot...

I'm having trouble keeping all these alkene reactions straight (hydroboration, oxymercuration/demurcuration, etc.) is there a useful website or an easier way to categorize/remember which reagents go with a particular reaction? My book isn't much help. Need help!

A 0.4793g sample of primary standard grade Na2CO3 was treated with 40.00mL of dilute HCl. The solution was boiled to remove CO2 and then excess HCl was back-titrated with 8.70mL of NaOH. In a separate experiment, it was established that 27.43mL of the HCl neutralized the hydroxide in a 25.00mL...

thanks for the websites, they were EXTREMELY useful, especially the second one!

the 1.799 comes from (39.98mL)(.04500mmoles/mL EDTA)=1.799

I changed my answer last minute to get the actual correct answers: mmoles Mg2+= (10.26)(.02065M)=.2119 mmoles Zn2+=(15.47mL)(.02065M)=.3195 mmoles Mn2+=1.799-.2119-.3195=1.278 (.2119mmolesMg2+)(24.3051mg/mmole)=5.150mg Mg2+ (.3195mmolesZn2+)(65.392mg/mmole)=20.89mg Zn2+...

I'm reviewing for a test and having a bit of trouble fully understanding the free-radical chain reactions and writing the mechanisms (initiation, propagation and termination) steps. For example, my book describes the mechanism for chlorination of methane and I just don't follow it very well...

I got 7.035mg Zn2+ , 2.14x10^3 mg Mg2+, and 5.95mg Mn 2+. I hope these values are correct,but if they are not then it is only an error in my math. thanks a lot for all your help! tipton12