faisalabdul16
Wot
- Joined
- Feb 16, 2014
- Messages
- 2,258
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- Male
- HSC
- 2014
Indeed it does. Hahaha, it's really good thoughlol, thread needs to be renamed 2014 Pre-HSC Marathon Thread
Indeed it does. Hahaha, it's really good thoughlol, thread needs to be renamed 2014 Pre-HSC Marathon Thread
1. Calculate the mass of anhydrous sodium carbonate required to prepare a certain volume and concentration of the solution.Outline the steps required in producing a standard solution and justify the choice of solid you use.
hahaha i ceebs doing this question, evidence though1. Calculate the mass of anhydrous sodium carbonate required to prepare a certain volume and concentration of the solution.
2. Measure this mass of the solid on pre-weighed filter paper with an electronic balance.
3. Transfer the solid into a beaker with distilled water and stir with stirring rod until dissolved.
4. Transfer solution from beaker into a volumetric flask of the volume you require with rinsed glass funnel.
5. Rinse beaker and stirring rod with distilled water and transfer this water into flask as well.
7. Add distilled water until just under the line. Then add distilled water via a dropper until bottom meniscus hits the line.
8. Stopper flask and shake to mix.
Anhydrous sodium carbonate was the chosen solid as it is stable in the air, highly soluble in water and of high purity. Other substances have changing concentrations as they do not possess the same qualities as anhydrous sodium carbonate (eg. NaOH and H2SO4 absorb water from the air adding to their weight). These substances would lead to inaccuracies and low reliability when used in titrations as their concentration would not be definite.
New Question: Assess the validity and accuracy of the evidence for increasing concentrations of oxides of sulfur and nitrogen in the atmosphere.
Notsureifsrs or sarcastic.FA16, Chem is so going to lift your atar.
Then there's the rest, still partying for the best :Ono legit. from what I briefly see, your chem knowledge is astounding
Its fasadabubsibauadul.FA16, Chem is so going to lift your atar.
bold part - ? hahahaThen there's the rest, still partying for the best :O
thanksno legit. from what I briefly see, your chem knowledge is astounding
Pretty much what happened to me - if I had increased my English mark by like, 5, I would probably have gotten into the 98s (from 96.50).Notsureifsrs or sarcastic.
English is. Me improving marks in any subject besides english, will marginally improve my atar. Whereas english, improving in that will boost my atar.
Hence why i have written 23412412341234 essays so far.
haha nah i wrote 8 or 9 essays last week, exposing myself to different questions.
Yeap! Something i realised while playing around with atar calculators and looking at the statistics UAC provides.Pretty much what happened to me - if I had increased my English mark by like, 5, I would probably have gotten into the 98s (from 96.50).
Must stop derailingPretty much what happened to me - if I had increased my English mark by like, 5, I would probably have gotten into the 98s (from 96.50).
This thread died. No one answersMust stop derailing
it had a good run! come over to the hsc economics marathonThis thread died. No one answers
hahaha i remember a fair amount of work from the prelim courseit had a good run! come over to the hsc economics marathon
HAHAHA yes someone to discuss with!OKAY FASABAULAHAH
I have memorised the chemistry course now (about bloody time). Bring it on.
(I don't do industrial btw haha)
1) The standard galvanic cell conditions weren't used. Standard conditions involve a inert platinum electrode immersed in 1.0 mol/L HCl with Hydrogen gas bubbled in at 100 kPa and 25 degrees Celsius
2) Low concentrations were being used so there were less cations to gain electrons and travel through the external circuit towards the cathode, thus producing a lower experimental potential difference than the theoretical value
3) Metals not completely pure (were they cleaned with emery paper beforehand) or impurities in electrolyte solutions.
If the third point isn't valid enough, some bs about how low quality voltmeters were used which put load on the external circuit thereby reducing potential voltage and/or the person observing was like close to blind etc