cratic\" Here is a possible reaction: H2O + NH3--> NH-+ +-OH In the space below

Question

cratic" Here is a possible reaction: H2O + NH3--> NH-+ +-OH In the space below draw out the full reaction using full Lewis structures and curved arrows to show the movement of electrons Draw: Erase- >Reset The pKa of H2O is 15.7, and the pKa of NH4+ is 9.24. Do you think the reaction mixture at equilibrium will contain: mostly products mostly reactants equal amounts of both o What do you think AG for the reaction as written (starting with 1M concentration of all reactants and products) will be? (Hint: Is this consistent withnegative your answer to the previous question?) zero

Explanation / Answer

H2O + NH3 <-----------------> NH4+ + OH-

weak acid strong acid

pKa 15.7 pka =9.24

The acid-base equilibria always favor the weak acid -base pair.

1)Thus this equilibrium lies towards left side . Hence the equilibrium mixture mostly contains reactants.

2) At equilibrium the delta G= 0

and delta G0 = positive as the equilibrium is tilted towards left side.

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