The Student Room Group
Uni students - Complete our survey >>
Uni students - Complete our survey >>
Uni students - Complete our survey >>

alkaline buffers

guys can someone pls explain this question in detailssss

info given in q : HCl is added to amonia solution ....... (then pic attached)

WHY does is say at equivalence point of this titration PH is less than 7!!!!! isnt this strong acid - weak base titration so PH meant to be more than 7! im so confused

also what does it mean by amonia solution? is NH4 plus or NH3 being added??
like is the equation im supposed to write NH4 or NH3

i dont get this at all :frown:

@MexicanKeith
Capture.PNG11.9KB
Is this from OCR A ?
Original post by coconut64
Is this from OCR A ?


this is unit 4 edexcel
Original post by pondsteps
guys can someone pls explain this question in detailssss

info given in q : HCl is added to amonia solution ....... (then pic attached)

WHY does is say at equivalence point of this titration PH is less than 7!!!!! isnt this strong acid - weak base titration so PH meant to be more than 7! im so confused

also what does it mean by amonia solution? is NH4 plus or NH3 being added??
like is the equation im supposed to write NH4 or NH3

i dont get this at all :frown:

@MexicanKeith


Ammonium chloride is produced which is slightly acidic and therefore (molar) equivalence point is < pH7

NH4+ + H2O --> H3O+ + NH3
Original post by TeachChemistry
Ammonium chloride is produced which is slightly acidic and therefore (molar) equivalence point is < pH7

NH4+ + H2O --> H3O+ + NH3


when it says amonia solution does it mean NH3 or NH4+ is added???
Original post by pondsteps
when it says amonia solution does it mean NH3 or NH4+ is added???


It means dilute ammonia solution which is

NH3 + H2O <--> NH4+ + OH-
Original post by TeachChemistry
It means dilute ammonia solution which is

NH3 + H2O <--> NH4+ + OH-


exactly! so NH3 is being added :frown: i dont understand where u got NH4+ + H2O --> H3O+ + OH- from for the answer ..... could u please expand ur answer..
Original post by pondsteps
exactly! so NH3 is being added :frown: i dont understand where u got NH4+ + H2O --> H3O+ + OH- from for the answer ..... could u please expand ur answer..



http://www.chemguide.co.uk/basicorg/acidbase/bases.html

Quick Reply

Related discussions

Latest

Trending

Trending

Articles for you