important question - c.a.b. pairs (1 Viewer)

[mathock]

can anybody help with conjugate acid/base pairs?? im in a bit of trouble i think

 

[bloodysunday]

well theyre fairly simple really, you could just take water and HCl for example:

HCl + H2O <=> H3O^+ + Cl^-

HCl and H3O are acids, H2O and Cl are bases
HCl is conjugate to Cl, H2O is conjugate to H3O

 

[lucyinthehole]

as far as i understand, to get the conjugate acid of a base, take away a H+. to get conjugate base of an acid, give it a H+ cos H+ is essentially another name for a proton. and acids are proton donors.

 

[mathock]

so if i was asked to find a conjugate base or conjugate acid how do i work it out?? i think i was sleeping when this was taught to our class

 

[CM_Tutor]

Any two species that differ by exactly one proton (H⁺) will form a conjugate acid / base pair. Examples include:

H₂O / H₃O⁺
H₂O / OH^-
CH₃COOH / CH₃CO₂^-
NH₃ / NH₄⁺

Note that H₃O⁺ / OH^- is NOT a conjugate pair, as the species differ by two protons. Although these species are both conjugates of water, they are not conjugates of one another.

 

[mathock]

thanks heaps, so under what topic is this??

 

[lucyinthehole]

acidic environment? i don't know.. they've all mixed in my head

 

[tina_goes_doo]

CM_Tutor...you are a champ.

 

[mathock]

yeah cm_tutor, ur my hero so ur really a teacher or wat?? coz ur a gun chemist... thanks heaps dude

 

[CM_Tutor]

I'm not a capital T teacher (in the NSW Dept of Ed sense), but I am a Chemist. I've also done lots of HSC tutoring, and know the syllabus almost backwards.

 

[mathock]

well ive posted another thread on cells... feel free to help me because im stressing pretty hard thanks in advance