Microscopic membrane filters (1 Viewer)

[meyero]

Do Microscopic membrane filters filter dissolved solids, coz my teacher said so and i thought she was a dumbass at the time but i was just checking.

PS she really is a dumbass and i hate her she hasnt prepared me for 2moz and im getting stressed, how can a teacher like that be allowed to teach chemistry? Sometimes i wonder if she has ever done a course on chemistry!

 

[danno]

i think they do.

dont take it for certain though, i probably know less than you

 

[Paroissien]

They filter solutes, particles and microorganisms

 

[lucyinthehole]

does solutes = ions?

 

[googleplex]

yeh you wanna know how good our teacher was she didnt even fucken do the water topic

now the way I see it, this is year 9 shit: dissolved solids can't be filtered.

but with nano-sized membrane filters can they?

 

[DAAVE]

MM filters will get rid of ANY particles that are larger than their pore size. This includes dissolved ions.

 

[LSP]

membrane filters are used to filter microorganisms, small particles as Paroissien said
BUT do not filtrate dissolved solids like ions

 

[lucyinthehole]

DAAVE + LSP = contradiction :S

 

[LSP]

nothing can filter dissolved solids unless it is done through gravimetric analysis

 

[helper]

Membrane technology uses osmosis and does seperate dissolved solids.

 

[Paroissien]

nothing can filter dissolved solids unless it is done through gravimetric analysis

Where did you pick that 'fact' up from?

 

[aim54x]

I go with the school of thought that says anything bigger than pore size. which is in the nano range in this case

 

[Xayma]

They can't filter dissolved solids. Well possibly the larger atoms but not anything small like NaCl

 

[Paroissien]

How small is NaCl anyway, in terms of nm

 

[eth]

They can't filter dissolved solids. Well possibly the larger atoms but not anything small like NaCl

Quite clearly they can, cos it works by reverse osmosis.

 

[helper]

How do you think they desalinate water for drinking by membrame filters. Been in the news in Sydney for the last week?

 

[sub]

hey xayma do u do industrial...? cos in the NaOH production the membrane filter CAN and does stop Cl- and OH- from moving through while Na can...so "yes" MM can filter dissolved solids (using NaCl as an example)

 

[mr EaZy]

with reverse osmosis it can.
cl- is a pretty big atom by the way

 

[Xayma]

hey xayma do u do industrial...? cos in the NaOH production the membrane filter CAN and does stop Cl- and OH- from moving through while Na can...so "yes" MM can filter dissolved solids (using NaCl as an example)

I do shipwrecks.

Cl^- is smaller then 10^-9 metres if not then oh well. How can it stop OH^- The best way would be to have an anode and cathode on opposite sides so the neutral water goes through.

 

[lucyinthehole]

so once and for all, filters dissolved ions?