Recent content by Taryn

Just wondering how to analyse mercury in the presence of cobalt by atomic absorption analysis given that both elements emit and absorb radiation at 235.65nm. I know that mercury isj examined using cold vapour atomic absorption analysis... but knowing this still doesn't help? Any hints would...

cheers for that! :)

[b]1. I have a relatively simple question, but I can't think of the answer. A high bp hydrocarbon (X) is obtained by the fractional distillation of crude oil. (X) is then heated in the presence of silicate materials. only 3 new hydrocarbons were from this proces. All I want to know is what...

Hey Thanks... that's helpful... I got the answer to the answer right thanks a heap!

Yeah I just tried to use that and still got it wrong its so frustrating! I will go and see my lecturer now and hopefully he can help. Can u see anything wrong with my process?

Thanks I will try that!

I used 4ml of acetic acid and 6ml of acetic anhydride. I don't know how knowing how much I put in shows which is the acetylating species?

You burn 103.4 mg of phenol in a calorimeter of heat capacity 1,483 J K-1 and the temperature rises by 1.83 oC. Determine the molar heat of combustion for phenol in kJ mol-1. The molar mass of phenol is 94.12 g mol-1 Ccal=deltaH/ deltaT This is what I did. n=.1034/94.12 =1.09859E-3mol...

You burn 136.8 mg of naphthalene in a calorimeter and the temperature of the calorimeter rises by 3.29 oC. Determine the calorimeter heat capacity in J K-1. The molar mass of naphthalene is 128.18 g mol-1 This is a question from a quiz I have to do. this is wat I did. Ccal=delta H/delta...

I did an experiment in one of the labs and I have a question I need to figure out. The experiment was the porduction of p-acetylaminotoluene, from p-toluidine. My question is we used acetic acid and acetic anhydride, but which is the acetyalting species. I thought of looking at the...

This is just a general question that I hope someone can answer. Why do we add alkali before extraction rather than afterwards? This is in the experiment I recently did, which was the preparation of p-Toluidine? This was my main thought... that it helps to saturate the solution so that when...

Thats cool anyhow I know I did... checked it using your way! Thanks for your time!

yeah okay wat I also did was letting u=x^7, du=7x^6 which is du/7=x^6 Then I got int 1/7(lnu^1/7)du Then I used log laws and so I then had 1/49 int (lnu)(du) I ended up gettin the answer (x^7lnx)/7 - (x^7)/49 + C Is this rite?

any suggestions for part 3... I know u need to integrate by parts... any pointers would be greatly appreciated

cool thanks... so its just easier to choose f(2)=0! Thanks agen!