• Want to help us with this year's BoS Trials?
    Let us know before 30 June. See this thread for details
  • Looking for HSC notes and resources?
    Check out our Notes & Resources page

Real Answers (1 Viewer)

Survivor39

Premium Member
Joined
May 23, 2003
Messages
4,467
Gender
Undisclosed
HSC
2003
Can you use titration/volumetric analysis to determine Ttoal dissolved solids? This is for the reference in Question 5 in the multiple choice.

I think it's D.
 

braindrainedAsh

Journalist
Joined
Feb 20, 2003
Messages
4,268
Location
Sydney
Gender
Female
HSC
2003
I dunno which one (ABCD) I picked but I thought it was the tripod with the filter (to remove undissolved soilds such as dirt first) and then the evaporating basin. I didn't think you could titrate to find the total dissolved soilds, but I may be wrong.
 

mei_ling03

Ain't love grand.
Joined
May 20, 2003
Messages
501
Location
Kingsford/Kensington
Gender
Female
HSC
2003
titration is used for volumetric analysis, which requires chemical reactions... TDS is more a physical thing so i chose the bunsen and the filter one (can't remember which letter it was)
 

+:: $i[Q]u3 ::+

Jaded Member
Joined
Apr 28, 2003
Messages
898
Gender
Female
HSC
2003
Ash is quite right.

you can't use titration. Titration may determine the concentration of one particular substance (eg Mg ions etc) but note how it says TOTal dissolved solids? it has to be everything.. all ions.. the only two ways are gravimetric and conductivitty testing.

With the gravimetric, you need to remove off undissolved solids first for the evaporation to be validly dissolved solids. what crappy grammar (and i have my 3u exam tmz =P). ubt u know what i mean.
 

Survivor39

Premium Member
Joined
May 23, 2003
Messages
4,467
Gender
Undisclosed
HSC
2003
Originally posted by Carla2003
so the answer to 15 is a???
Where's this come from? we are discussing about Question 5.
But 15 is A
 

Misturi

[Studying...]
Joined
Aug 31, 2003
Messages
2,056
Location
Greater West
Gender
Female
HSC
2004
I put D in question 5. Isn't one of them a separation of two liquids? (as one of the options)
 

hipsta_jess

Up the mighty red V
Joined
May 30, 2003
Messages
5,981
Gender
Female
HSC
N/A
i think i put D for 5...was that the one with the evaporating basin, and the tripod/filter paper one?
i think it was Q and S??
 

Misturi

[Studying...]
Joined
Aug 31, 2003
Messages
2,056
Location
Greater West
Gender
Female
HSC
2004
Yeah that was it. P was titration, Q was evaporating basin, R was a separating liquid thing and S was the tripod filter paper (l may have mixed Q and S up there...)
 

iambored

dum-di-dum
Joined
Apr 27, 2003
Messages
10,862
Location
here
Gender
Undisclosed
HSC
2003
i think the question was a big ambiguous. i thought they meant 2 separate ways, not 1 way with 2 things
 

Survivor39

Premium Member
Joined
May 23, 2003
Messages
4,467
Gender
Undisclosed
HSC
2003
But I don't think you could use titration to determine the TDS!! So it can't be A.
It's D!
 

iambored

dum-di-dum
Joined
Apr 27, 2003
Messages
10,862
Location
here
Gender
Undisclosed
HSC
2003
i got the answer in another thread

firstly, it said MUDDY WATER, i assumed it was clear water, therefore you do have to filter and then evaporate
Originally posted by Survivor39
But I don't think you could use titration to determine the TDS!! So it can't be A.
It's D!
but i did it by elimination. first i thought it was definitely not S(the filter) which left me with A and C, and i knew it was not the separating funnel either so i had to choose A

i misinterpreted the question
 

Users Who Are Viewing This Thread (Users: 0, Guests: 1)

Top