Consider the endothermic reaction: Fe(H2O)63+(aq) + 4Cl-(aq) FeCl4-(aq) + 6H2O(l
ID: 485193 • Letter: C
Question
Consider the endothermic reaction: Fe(H2O)63+(aq) + 4Cl-(aq) FeCl4-(aq) + 6H2O(l) Write the equilibrium constant expression for this reaction. If the system described by the equation above is initially at equilibrium, with [Fe(H2O)63+] = 0.10 M and [Cl-] = 6.0 M, determine the direction of the shift in position of equilibrium (left, right, no shift, or cannot be determined) and justify your answer (be complete) for each of the following. Temperature remains constant, except where noted. Some solid iron (III) nitrate nonahydrate is added. Some solid iron (II) sulfate heptahydrate is added. Some solid sodium chloride is added. Some solid sodium phosphate dodecahydrate is added. Some liquid water is added. Some 0.10M aqueous silver nitrate is added. Some 12 M hydrochloric acid is added. Some 6 M hydrochloric acid is added. Some 0.20 M aqueous iron (III) nitrate is added. The temperature of the solution is lowered by 10°C.
Explanation / Answer
1. we hve to apply lechatlier principle to each situation,
since recation is endo thermic.heat is absorbed in the eaction and so if temperature remains constant there is no shift in equilirium as system is totally unaffected by temperature.
2.Fe (3+) salt s added and so as Fe(3+) concentration increses, concentration on left side of equation increses and so reaction pushes to forward direction
3.NaCl addition will increse cl- ion concentration. so again forward reaction is pushed.
4.Fe(2+) salt is added and so concentration of right side increses, and so as to make it to come to equilibrium reaction is pushed to backward.
4. decahydrate will be of aquoes phase ans so pushes forward
5.water added and so H2O content incresed on right side so rection pushes left side as in backward direction
6.silvernitrate doesnt affect reaction at all sice it is not a reactant or product
7.12M HCl makes reaction acidic so cant be predicted hw reaction will behave
8.as cl- ion increses forward reaction happens
10.tempereature decreses it goes back ward.inceresing temperature lead to endo thermic rection as it absobs heat