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...
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 =[
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 =[
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
\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...