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i cant remember the numbers. however i can apply a common sense approach... the H2SO4 was originally the same conecntration as the KOH. However it was diluted by a factor of 10x. Therefore only 1.5mL of KOH would be required (as 15mL of H2SO4 was used) However, since sulfuric acid is diprotic...

they don't use white light for AAS. they use a lamp that emits radiation of a wavelength known to be absorbed by the sample being tested for. it is D

yeah its true about the catalysts... i cant remmeber where i read it. but either in esterification or hydration, the sulfuric acid actually attaches to form ethyl something or other, but then is reformed at the end

i got 18000 ppm for the chlorine (to 2 or 3 sig fig i cant remember) KOH i got 3mL....

12A 13A

yeah i did the same. and yeah its definately ethyl hexanoate

citric acid is an acid. from this we get the conjugate base citrate. sodium citrate contains the citrate acid, which is the conjugate base of citric acid sodium chloride is neutral. ammonium is the conjugate acid of the base ammonia, hence they are acidic

does anyone know when the board of studies release the HSC 2007 chemistry paper on their website?

yeah we just had to draw the structural formula in the box aye?

phenolphthalein is colourless below ph 8.2 and pink above pH 10

omg i was just gonna ask this... i didnt know if it meant an equipment... because it said "You have performed a first-hand investigation to model an equilibrium reaction" i said the SCN- Fe3+ equilibrium reaction but thats an experiment

6C 9A 10C 12A

did anyone finish with ages to go? i had an hour... and im pretty sure i checked all my worked. but im worried i missed a question. i recgonise all the ones uv been tlkn about in this forum which is good

haha yeah i got 1.33 did any finish with ages to go? i had an hour... and i think i checked everything but now im worring about missing a question

it doesn't matter that it was 373K. probably just put there to try to confuse people... my teacher always told me to state the equilibrium with a temperature.. eg. K = 1.33 at 373K Since it changes. But no, don't think it was meant to be 273K