Assignment Question... (1 Viewer)

[Althea]

Hi there,

Could anyone please help me with this question? Any help would be greatly appreciated... thanks!

Give a balanced ionic equation to explain...

potassium carbonate / basic solution

 

[crazybrad]

this couild be what your after, im not sure?

K(CO3)2 > K2+ + 2(CO3)2-

K2+ + excess H20 > no reaction

2CO3 2- + excess h2o > 2HCO3- + 2OH- .... hydroxide ions produced, solutuion is basic.

total ionic equation
K+(aq) + 2CO3 2-(aq) + H2O(l) > K+ 2HCO3- + OH-

NIE
2CO3 2-(aq) + H2O(l) > 2HCO3-(aq) + OH-(aq)




i think this is what yopur after But me not sure

 

[CM_Tutor]

I had skipped this question, as I wasn't sure what it meant. If crazybrad is correct in his interpretation that it means explain why a solution of potassium carbonate is basic, then I agree with his approach - but not with his equations, as they are not balanced. The correct equations are:

Dissolution:

K₂CO₃ (s) ---H₂O---> 2K⁺ (aq) + CO₃^2- (aq)

Protonation of carbonate ion:

CO₃^2- (aq) + H₂O (l) <---> HCO₃^- (aq) + OH^- (aq)