[andynam89]

Problem:   Given the following information,
HF(aq)  <=>  H+(aq) + F-(aq)                     
H₂C₂O₄(aq)  <=>  2H+(aq) + C₂O₄^2-(aq)       
Kc = 6.8 X 10^-4
Kc = 3.8 X 10^-6

Determine the value of Kc for the reaction
2HF(aq) + C₂O₄^2-(aq)  <=>  2F-(aq) + H₂C₂O₄(aq)

Im stuck on this one question and i have no clue. Thanks

[savy2020]

What do you mean by stuck??
Well my clue is write down the expression for K_c in both cases and also in the net reaction.
Rearrange the K_c for the net reaction{by multiplying and dividing the same concentration term like multiplying numr by [F^-] and denomr by the same} so as to get the expressions of the first two reactions

Hope you followed. If not reply.. I'll make it clear