Saved Bookmarks
| 1. |
The ionisation constant of overset(oplus)NH_(4)ion in water5.6xx10^(-10)" at "25^(@)CThe rate constant for the reaction of overset(oplus)NH_(4) and oversetThetaOHion to formNH_(3) and H_(2)O " at " 25^(@)C" is " 3.4xx10^(10)"L.mol"^(-1).s^(-1) Calculate the rate constant for proton transfer from water toNH_(3) |
|
Answer» Solution :Given `NH_(4)^(+)+H_(2)OhArrNH_(3)+H_(3)O^(+)` `K_(a) = ([NH_(3)][H_(3)O^(+)])/([NH_(4)^(+)][H_(2)O]) (K_(a)= 5.6xx10^(-10))""...[1]` `NH_(4)^(+)+BAR(O)Hunderset(k_(b))OVERSET(k_(f))hArrNH_(3)+H_(2)O` `""(k_(f)=3.4xx10^(10)"L.mol"^(-1).s^(-1))""...[2]` `K_(eq)=(k_(f))/(k_(b))=([NH_(3)][H_(2)O])/([NH_(4)^(+)][OH^(-)])` `=([NH_(3)][H_(3)O^(+)])/([NH_(4)^(+)][H_(2)O])xx([H_(2)O]^(2))/([H_(3)O^(+)][OH^(-)])=(K_(a))/(K_(W))` `thereforek_(b)=(K_(w))/(K_(a))xxk_(f)=(1.0xx10^(-14))/(5.6xx10^(-10))xx3.4xx10^(10)=6.07xx10^(5)` |
|