question archive The dissociation constant of a weak acid HA and weak base BOH are 2×10-5 and 5×10-6 respectively
The dissociation constant of a weak acid HA and weak base BOH are 2×10-5 and 5×10-6 respectively
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The dissociation constant of a weak acid HA and weak base BOH are 2×10-5 and 5×10-6 respectively.The equilibrium constant for the neutralization reaction of the two is ( ignore hydrolysis of resulting salt)
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Answer:
A neutralization reaction is when an acid and base react to form water and a salt in the presence of hydrogen ions. For the neutralization reaction for weak acid and weak base, the expression of the equilibrium constant K is given as
K= Ka * Kb/Kw
HA + BOH ------------------> B+ + A- + H2O
K = [B+][A-][H2O]/[HA][BOH]
= [B+][OH-]/[BOH] * [H+][A-]/[HA] * [H2O]/[H+][OH-] = Kb * Ka / Kw
Weak acid HA, Ka=2×10-5 and weak base BOH, KB=5×10-6Kh=Ka×KbKh=Keq=Ka×KbKeq= (2×10-5)(5×10-6)Keq=10×10-11Keq=1×10-10
