We Are Only Up to Acidic Environment!!!HELP! (1 Viewer)

[Survivor39]

Just kidding, we are almost finish the course.

Anyway, now I got your attention I would like to ask a question on one of the dot point on The Acidic environment.

Identify a range of salts which form acidic, basic or neutral solutions
ok this is what I know so far:
Acidic salt: NaHSO4, NH4NO3, NH4Cl, (NH4)2SO4....
Basic salts KNO2, CH3COOHK, CH2COONa...
Neutral salt: NaCl, KCl, KNO2, K2SO4

Am I correct so far??

Explain their acidic, neutral or basic nature.
I think I'm wrong, but this is what I know
If a strong parent base is added to a weak parent acid, then the salt produced will be basic.

If a strong parent acid is added to a weak parent base, then the salt produced will be acidic.

If a strong parent acid is added to a strong parent base, then the salt produced will be neutral, and vice versa.

Is this correct?? more importantly, Is this related to this dot point?

 

[Starlette]

Yeah ur correct, I didnt know that, that was in the syllabus :|

 

[Misturi]

...l have no idea what your talking about and l am having my HSC exam in onvember!!

 

[ballerinabarbie]

yeah that's all good!! (i didn't check your specific salts though) but the "describe their nature" bit was correct

 

[Huy]

Originally posted by Starlette
Yeah ur correct, I didnt know that, that was in the syllabus :|

SB + SB = Neutral
WA + SB = Basic
WB + SA = Acidic

(S = strong, W = weak, B = base, A = acid)



/edit
LOL at the attention grabbing title, Survivor

 

[Survivor39]

But i thought the second part is about the salt adding to water to give either hydronium ions or OH ions, thus giving their acidic/basic nature, not the parent acid/base explanation....

At least that's what the CUS site said....

 

[Tia]

do you know i'm gonna die?

 

[FLR-IT]

Originally posted by Survivor39
But i thought the second part is about the salt adding to water to give either hydronium ions or OH ions, thus giving their acidic/basic nature, not the parent acid/base explanation....

At least that's what the CUS site said....

yeah ur rite, its pretty confusing

context is good in explaining this

 

[Survivor39]

Originally posted by FLR-IT
yeah ur rite, its pretty confusing

context is good in explaining this

So which one should I stick to?? My understanding of parent acid/base which determines the nature of the salt? Or follow the CUS and some text books said about giving Hydronium ions/OH ions in water to give the salt it's nature?

 

[FLR-IT]

no idea. its all pretty vague to me as well

from my understanding the parent acid/base method is fine. but if the question asks for detailed explainations then u may have to go into all the hydronium ions and hydroxide ions

 

[chunder]

this is pretty straight forward if you are willing to do some memory work. The pH of salts are determined by their nature post hydrolysis.

e.g. hydrolysis of NaCl produces Na and Cl ions.....apply this concept for all salts. After you've done this consider the following facts:

(1) Anions of strong acids are neutral (e.g. Cl-)
(2) Anions of weak acids are basic (e.g. CH3COO-)
(3) Anions of polyprotic acids are acidic (e.g. HS04-.....however there are exceptions)

(4) Cations are strong bases are neutral
(5) Cations of transition metals are acidic

therefore NaHSO4 through hydrolysis produces Na+ and HSO4-. Na+ is neutral as it's a cation of a strong base and HSO4- is acidic as it's a polyprotic anion......hence NaHSO4 is acidic.