PAG 4.1 identifying Unknowns OCR A chemistry

Frank Peters

has anyone done the PAG 4.1 identifying unknowns extension opportunities.

I have no idea how to make the equations

Reply 1

TSR Jessica

Sorry you've not had any responses about this. :frown:

Are you sure you've posted in the right place? :smile:

Here's a link to our subject forum which should help get you more responses if you post there. :redface:

Just quoting in Amusing Elk so she can move the thread if needed :wizard:

Spoiler

Reply 2

lilli1111

Original post by Frank Peters

has anyone done the PAG 4.1 identifying unknowns extension opportunities.

I have no idea how to make the equations

Hey! I'm stuck on the equations at the moment. Is there anyway you could tell me what you got if you happen to know. Thank you. You'd be a lifesaver

Reply 3

koala970

extension qs
addition of AgNO3 to the filtrate: Ag (aq) Cl- (aq) --> AgCl (s)
addition of ammonia to the white precipitate: AgCl (s) --> Ag (aq) Cl- (aq)
addition of nitric acid to the residue: BaCO3(s) 2 HNO3 (aq) --> Ba(NO3)2 (aq) +co2+h20
addition of H2SO4 to filtrate: Ba2 (aq) SO4 2- (aq) --> BaSO4(s)
addition of K2CrO4 to filtrate: Ba2 (aq) CrO4 2- (aq) --> BaCrO4 (s)

(edited 2 years ago)

Reply 4

Kaeto4

Original post by koala970

extension qs
addition of agno3 to the filtrate: Ag (aq) cl- (aq) --> agcl (s)
addition of ammonia to the white precipitate: Agcl (s) --> ag (aq) cl- (aq)
addition of nitric acid to the residue: Baco3(s) 2 hno3 (aq) --> ba(no3)2 (aq) +co2+h20
addition of h2so4 to filtrate: Ba2 (aq) so4 2- (aq) --> baso4(s)
addition of k2cro4 to filtrate: Ba2 (aq) cro4 2- (aq) --> bacro4 (s)