Potassium hydrogen carbonate acidic, basic or neutral salt? (1 Viewer)

[enigma_1]

and how do you know?

 

[kev-kun]

Hopefully explains it ^^

 

[QZP]

View attachment 30214

Hopefully explains it ^^

Poor explanation. What's with the hydrates? Shouldn't even be talking about that if we're looking at an aqueous reaction.

 

[iStudent]

adding to kev's explanation, KHCO3 is formed from KOH, a strong base and H2CO3, a weak acid that does not completely ionise
so the resultant salt is basic.

 

[someth1ng]

adding to kev's explanation, KHCO3 is formed from KOH, a strong base and H2CO3, a weak acid that does not completely ionise
so the resultant salt is basic.

Just this should suffice. kev-kun's explanation is poor because it doesn't explain why it isn't acidic, that is, why it's not acidic because it can donate protons.

 

[theprofitable95]

KHCO3 can dissociate into K+ and HCO3-. K+ is a neutral ion. HCO3 exists in two different equilibrium
H2CO3 + H20 <-> HCO3- + H3O+ (first ionisation of carbonic acid)
HCO3- + H20 <-> CO3 2- + H3o+ (second ionisation)
The equilibrium of the second ionisation lies very far to the left, so HCO3 does not have much of a tendency to donate protons, and is thus not acidic in solution. H2CO3 is a weak acid, and equilbrium also lies to the left (as someone earlier mentioned). Hence HCO3 has more of a tendency to accept electrons, and is hence BASIC in solution. However, HCO3 is actually an amphiprotic substance (and should always be referred to as such), but it is basic in solution for the reasons above.

 

[hit patel]

Make it easier: Formed from strong base KOH and weak acid H2CO3. Therefore the conjugate of h2co3 would HCO3- would be a strong base and the conjugate of KOH K+ would be a weak acid.

 

[QZP]

Make it easier: Formed from strong base KOH and weak acid H2CO3. Therefore the conjugate of h2co3 would HCO3- would be a strong base and the conjugate of KOH K+ would be a weak acid.

How do you know that :L