Lawn Fertiliser Prac - What percentage yields of sulfate did you guys get?

[clintmyster]

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Just wondering, what kind of yields did you guys get and what is the actual accepted value?

For ours we used Potassium sulfate as our fertiliser. I used 4g of it to start off with. In the end my percentage yield was about 72%. Is that about right? Also is it possible to get yields of about 90%?

[Pwnage101]

you should be getting very low yields, like 20%, in the experiment because the main point was to illustrate how unreliable it is - however a higher percentage would hgave been attained if you actually implemented the improvements you suggest in the dot point. But yeh, just doing it normally shouldnt yield that high

[clintmyster]

Originally Posted by Pwnage101

you should be getting very low yields, like 20%, in the experiment because the main point was to illustrate how unreliable it is - however a higher percentage would hgave been attained if you actually implemented the improvements you suggest in the dot point. But yeh, just doing it normally shouldnt yield that high

I tried to make like the most accurate experiment known to man haha. We kept isolating the precipitate by decanting, but the thing we decanted, we added more BaCl2 and more precipitate formed so we kept doing that until none more formed. Took four attempts before no more precipitate was formed.

[Pwnage101]

Originally Posted by clintmyster

I tried to make like the most accurate experiment known to man haha. We kept isolating the precipitate by decanting, but the thing we decanted, we added more BaCl2 and more precipitate formed so we kept doing that until none more formed. Took four attempts before no more precipitate was formed.

kool

You do realise though that in the Trial (CSSSA, NEAP, IND at least) and HSC they wont ask what percentage you got. They dont ask the numeric results of any experiments in fact, just observations and stuff. For that basically know how to improve accuracy of the experiment as thats a common Q.

[random-1005]

Originally Posted by clintmyster

Just wondering, what kind of yields did you guys get and what is the actual accepted value?

For ours we used Potassium sulfate as our fertiliser. I used 4g of it to start off with. In the end my percentage yield was about 72%. Is that about right? Also is it possible to get yields of about 90%?

HAHA. which private school do you go to???, you do 4 u maths and phys and chem, a person with those subjects would be expected to be somewhat smart.

obviously every fertiliser is going to have a different recipe, you cannot assume that they are going to be roughly equal!

[shady145]

Originally Posted by random-1005

HAHA. which private school do you go to???, you do 4 u maths and phys and chem, a person with those subjects would be expected to be somewhat smart.

obviously every fertiliser is going to have a different recipe, you cannot assume that they are going to be roughly equal!

lol do u surf BoS and try find people to cut
our experiment got f'ed. when heating the barium sulfate solution my teacher said dnt worry about it, then later she was like wait maybe the heating was to make bigger particles making it easier to filter, so we just threw it after filtering for 2 days

[zazzy1234]

AT SCOOL WE GOT 49% BROZ

[zazzy1234]

Originally Posted by Pwnage101

kool

You do realise though that in the Trial (CSSSA, NEAP, IND at least) and HSC they wont ask what percentage you got. They dont ask the numeric results of any experiments in fact, just observations and stuff. For that basically know how to improve accuracy of the experiment as thats a common Q.

ACTUALLY IF U WANT THE TRUTH, THEY CAN IN THE HSC AND THEY DO!!!

WANT PROOF???

LOOK AT QUESTION 27a IN THE 2003 PAPER HSC

[random-1005]

Originally Posted by zazzy1234

ACTUALLY IF U WANT THE TRUTH, THEY CAN IN THE HSC AND THEY DO!!!

WANT PROOF???

LOOK AT QUESTION 27a IN THE 2003 PAPER HSC

he said they wont ask the percentage YOU get (in YOUR experiment) ie. you never need to remember the numbers you got, however they can make you calculate values from second hand experiment data

[Aerath]

72% isn't wrong. Different fertilisers have different results. At school we got something like 52%, but at USyd, when we did it there, we got something like 74.2%.

[Pwnage101]

With regards to

Originally Posted by zazzy1234

ACTUALLY IF U WANT THE TRUTH, THEY CAN IN THE HSC AND THEY DO!!!

WANT PROOF???

LOOK AT QUESTION 27a IN THE 2003 PAPER HSC

you obviously misunderstood. This is what i was saying:

Originally Posted by random-1005

he said they wont ask the percentage YOU get (in YOUR experiment) ie. you never need to remember the numbers you got, however they can make you calculate values from second hand experiment data

ofcourse they can get you to calculate a certain percentage and stuff.

[zazzy1234]

Originally Posted by random-1005

he said they wont ask the percentage YOU get (in YOUR experiment) ie. you never need to remember the numbers you got, however they can make you calculate values from second hand experiment data

yeeeeeeeeeeeeeeeeeeh i knew that =p

[clintmyster]

Originally Posted by random-1005

HAHA. which private school do you go to???, you do 4 u maths and phys and chem, a person with those subjects would be expected to be somewhat smart.

obviously every fertiliser is going to have a different recipe, you cannot assume that they are going to be roughly equal!

I don't go to a private school.
Not that I am, but what if I was struggling in chem? Besides when most of the stuff in chem is just basically memorising stuff, a lot of the most obvious stuff slips people's minds as evident through pwnage not even mentioning your point.