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PLS HELP inorganic chemistry a level

if u are given a volume of an aqueous solution why cant u find the mass directly using 1g=1cm3????

e.g cuso4 at volume 25cm3 and concentration 0.5moldm-3.
if i know that 1g=1cm3

shouldn't 25cm3 of cuso4 be (((((25g))))???????....but it's not

u find out the grams of cuso4 by doing (25cm3/1000)*0.5 = moles of cuso4
then moles of cuso4*mr of cuso4
the answer is 0.0125
and if u convert that into mass it is ((((((1.99125g))))))))

(edited 5 years ago)

Reply 1

Pigster

1 g = 1 cm3 of the water part of the solution.

The solute part (the 0.5 mol dm-3) tells you about how much CuSO4 there is dissolved into the water.

Reply 2

anonymoussse

WOW that's crazy thank u!! <3 (what resource/source are you referencing?)

Original post by Pigster

1 g = 1 cm3 of the water part of the solution.

The solute part (the 0.5 mol dm-3) tells you about how much CuSO4 there is dissolved into the water.

Reply 3

Pigster

Original post by ggxsywes

WOW that's crazy thank u!! <3 (what resource/source are you referencing?)

My brain.

Reply 4

anonymoussse

Is it very basic knowledge bc I feel d*mb now lol

Original post by Pigster

My brain.

Reply 5

Pigster

Original post by ggxsywes

Is it very basic knowledge bc I feel d*mb now lol

Rather than call it basic, I would call it fundamental.

But the whole thing about teaching is finding out what someone doesn't know and then making them know it.

Hopefully you didn't and now do.

Reply 6

anonymoussse

yeah i totally forgot that that's the density of WATER and 1g=1cm-3 is going to be the same for all subtances lol

Original post by Pigster

Rather than call it basic, I would call it fundamental.

But the whole thing about teaching is finding out what someone doesn't know and then making them know it.

Hopefully you didn't and now do.