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hah thats what i did too~ mathematical approaches ftw =p

Sorry, but I don't quite understand... I know NaOH is not suitable as a primary standard due to the fact that it's relatively unstable and stuff, but when you standardise it, wouldn't the mass of NaOH still be constantly changing and you can't really use it for titration?? Hah HSC on monday...

ahh so rusting mainly occurs only for iron?? and hey, nice definition for corrosion, never thought of that =p thanks!

Re: Is itr eally neccesary to memorise the precipitation reactions and the processes do we need to know everything about EDTA and Winkler methods? the methods are so annoying and hard to memorise =[

ahh damn, corrosion is different from rust ay? can you tell me what's the difference? hah ma bad

but zinc would rust first right?? mabe the question is wrong... arghh at times like these, my teacher has to give me weird questions to confuse me! =[

ma teacher's worksheet, dont noe where he got it from sorry~

im guessing the salt water must hv balanced out the charges b4 OH- migrates bak there~ but im not too certain...

because in that case, Zn is more reactive, so it will be oxidised preferentially compared to iron, and what is gaining the electrons from zinc is only water and oxygen, i dun think there are any iron ions in there as the question didnt say, so there are no iron ions to be reduced... so what i...

Okay the question goes Phenolphthalein indicator turns pink in the presence of OH- ions. Consider a simple galvanic cell in which the two electrodes are zinc and iron, immersed into a saltwater electrolyte containing phenolphthalein... a) at which electrode will the electrolyte turn pink? (i...

do we actually have to know his two laws of electrolysis? ie finding the amount of a metal forms in an electrolytic cell with a given amount of time and current? :S i hope not =[

hah what i said is what i wish it would turned out to be =p imagine harder 3unit becomes easier 3unit ><!

Easy to Hardest : Harder 3u, Mechanics, conics, complex no. polynomials, volumes, integrations, graphs =p =p

so you mean, the module is now putting emphasis on pretty much the techniques eh?

umm, rate??? next word - tsuru

Hey just want to ask, i came across with this question asking if the concentration of one of the ion in the oxidation half-cell increases, would the voltage increase or decrease... The answer it decreases... Can anyone explain to me why??? Thanks =]

to GUSSSS - lolx, i used to like animes =p so u might noe where my name came from to MC - really??? i think it was in one of my skools past paper :S XD

thanks a lot =] that did explain to me ^^

i just aint sure why if alpha is a multiple root, then the reciprocal is also a multiple root...

\alpha is a root of x^{4}+2x^{3}+ax^{2}+2x+1=0 and a does not equal to 2,-6 i showed the first question and second question that i) \alpha\neq 0, \pm 1 ii) x=\frac{1}{\alpha} but im up to the third part of the question that asks me to deduce if \alpha is a multiple root, then its multiplicity...