ChemSiddiqui

Hi all, I have read alot about acid-base titration in books and whenever I come across this topic I have observed that in titration reaction the volume of acid is taken to be less than that of an alkali.I have 2 questions. 1.Is my observation correct or not? 2. If so what is the reason for the said observation? Any help will be most appreciated by me as always!!!!

Thnx alot testo! Cheers!

thnx 4 the help. I shall do as u say. I understand the terms you highlighted but wanted a broad yet easy explaination. But, hey thnx again.

agentchange thnx for them, I have tried wikipedia before. It is my first choice evertime I search for anything regarding chemistry. Have you or any1 else got a different link. Seriously, Google is of no help in this matter. thnx anyway

Hi, Can someone explain 'Inert Pair Effect' to me. It is not in A'levels syllabus but is important in understading the stabilities of Group IV element. I have read all the books I have and got nothing out of it. You can provide links that could explain it easily, if you like. Thnxx

Hi, I just read Group IV today and was surprised to know that Carbon melting point was higher than that of lead or tin. The explaination the book gave was that the giant covalent bonding in carbon doesn't allow the electron to move and thus it requires greater energy to separate the bonds and melt carbon. While metallic bonding shown by tin or lead is weak. the idea didn't sink in. Can any 1 help.

Hi, I have some questions please answer them for me: which is true about catalyst; A. They lower the activation energy for a reaction OR B. They provide a different pathway, one with lower activation energy. Now some books say the former but my teacher believes the latter is actually true. What is your say on it. The below is a worked example from a book which I think has mistakenly printed it. what you say: " What is the pH of 2 mol dm-3 NaOH? NaOh is a strong base, so it exists as ions. So [OH] = [NaOH] = 2 mol dm-3 so -log[OH] = -log2 so pOH = - 0.3 so pH = 14 - (-0.3) = 14.3 " Now how can the pH of anything be 14.3. please help out in the above situations. thnx

Hi, I am preparing for interview at oxford for chemistry undergraduate chemistry course (MCHEM). I am looking for some tricky questions that might help me to enhance my understanding regarding different chemistry questions. If any1 of you has links to any website which have questions which can particularly help me in my chemistry interview I would be grateful if u provide me with that. And i have a question i need help in. it came as oxford university interview question: "calculate the average interatomic spacings particles in the room". any help:confused:

Hi, I was asked this question by my friend and when I gave away my answer he was unconvinced. So I ask you whether I was right or not. He asked me what was the actual meaning of 'End-Point' when you do titration. I said that it is meant to be the end of reaction indicator. He argued that if that was the case then when we do neutralisation using a strong alkali and a weak acid then why the graph of that reaction shows that the end-point(in terms of ph) might have reached at ph9. I was so confused about it that i told him that end-point does not necessarily means to reach a certain ph which might indicate us that the reaction has completed. I told him if he'd done a redox titration then ph was out of the question. But, still he looked unsatisfied. All I ask is can any 1 tell me how to best define endpoint and when we do a titration of a strong alkali with a weak acid, maybe use a buffer as well then how can we find the endpoint in the graph for that reaction(titration). Anyhelp will b appreciated

Hi, benzene has a sandwich structure with delocalised pi electron over and under the carbon ring. Does this gives the stability to benzene because all the p-orbitals overlap to form a diffused ring of electrons. Or is it something else. Thnx

Hi, I was taught the structure of benzene the other day by my teacher and he explained it with the help of hybridization. Firstly how well u define hybridization. I know it a little but don't think it is required at A'levels. Nonetheless I am curious to find out everything about it. Can any1 help

thnx 4 that

How are the rate equation made or determined. Can any one leave some good links which describes rate equations in detail thnx

I appreciate ur reviewing this matter critically. I would like to tell that my father lives in the Uk and pay every kind of taxes. I think maybe its because i didn't expalin it or u got it wrong, that my piont was even if you pay all sort of taxes be it council tax, bills or anyother and if you are living in somewehre outside the uk, then why there is not any policy which protects british national like me from oversea fee rate. i however by no mean intended to critise the policy it was just a general question. thnx for ur reply though!

[FONT="Garamond"]Well I would like to ask this question to all the people who live and study in the UK. You see,i am applying for an undergraduate chemistry course at the University of Oxford and ofcourse since I am from Pakistan, I will be considered an 'oversea' student. Now, have u lot looked at the fee structure for local 'home' students to that of an oversea 'international' student? The home fee is somewhere between 3000 to 3300 quids while for oversea students it is roughly 9000 pounds and that excludes living cost. Now do u ppl think this is fair. if u want to attract oversea students to come and study in the Uk would u not have a different policy. And if any1 here wants to question as to why i want to come to the uk for studies then i believe it is fair to mention that i am a british national and want to study in the uk. Please dicuss the said matter.[/font]

Hi, its my time time posting at any physics section in SFN. Well, I have a question. I wonder when you put a glass bottle of say pepsi or coke or whatever in a freezer, why it get broke after a limited period of time. Is it due to the expansion ...I doubt it? Please if any1 has the answer oblige it. thnx

Thanks that all I wanted to know

Hi, Please brief me a little about the UK education system (except Scotland), e.g 6th form etc.

Thnx I value your suggestion and support, just pray for me that I make into oxford.

Hi, Its been a while i haven't written; as i said i had to take exam in early june and i was just busy there. Anyway, i am begining to come to the end of myA'levels course in a years time and am going to apply for Oxford for MChem Degree. If anyone here has any information or experience of ever applying to oxford to studying at oxford please write me the neccessary details. I shall appreciate it . Thnx

Hi, I first of all would like to ask for your comment on the difference between Mchem and BSc and secondly your opinion which is better. Thnx

ok, thank for any help, however i think i'd ask this question. If we are given 25 ml of hydrogen peroxide of 1.00 M, then when we have to reduce the concentration to 0.5 M, can we use this formula C1V1 = C2V2 Anyway, thanks for your answers and replies

No, i did not sound harsh and i feel you are right in saying that i need to do it my self but you see, here due to exams in about a fortnight away and i did not mention that i am in a college which are short of appratus so i was sent to another institution to prepare for my practicals and they think that we have been things that you do in lab as usual, but we were not. I must say that i shoud have told about this earlier. Anyway, i did ask for proper links to that if no one wants to answer me( understandibly so because i understand the intention).

Hi, well i have been writing at the chemistry section as well as the experiment sections but i have not recieved a single reply. Now this is really frustrating( i am sorry but i need to express my feeling here, but i have exams in a fortnight and i only sit on the internet just to check whether there are any replies to my problem!). Well, i think its better to digest my anger and try on this section because i was told to get quick replies this is the best place. MY QUESTION: " How do you prepare a solution of any substance if given to prepare X mol dm-3 solution. For example, if we are given hydrogen peroxide, then how will we prepare a 1.00 mol dm-3 solution of it. Then using the solution we just prepared how will we prepare a 0.5 mol dm-3 and etc" I would sincerely appreciate any help!

Hi, how would i prepare 23cm3 of 1.00 mol dm-3 of sucrose solution. And also does any one here know a link or a website where there is a tutorial for making solutions of different molarities! I appreciate any help!