Question

Determine if the system shifted toward reactants or products for each of the changes.

Explain how each change affected the equilibrium in terms of Le Châtelier’s principle.

For the forward reaction, is the system endothermic or exothermic?

Fe⁺³(aq) + SCN^–(aq) ⇋ Fe(SCN)⁺²(aq)

a. The addition of KSCN

b. The addition of Fe(NO₃)₃

c. The addition of NaF (s)

d. hot water bath

e. ice water bath

[CoCl₄]^–2(alcohol) + 6 H₂O(ℓ) ⇋ [Co(H₂O)₆]⁺²(aq) + 4 Cl^–(aq)

a. addition of HCl

b. addition of deionized water

c. addition of AgNO₃

d. hot water bath

e. ice water bath

Answer 1

Date: Le Chatler's Principle. It states that when a system at equilibrium is disturbed by changing the Temperatur, Pressure, Volume a concentration ; the system will tend to oppose the change implied in order to achieve new equilibrium state a Fe 2+ + SEN & FE SCN²t + heat This reaction is exothermie ie. heat is released in the system. Exothermie reactions occur at low temperature I K= [Fe SCN 2+ J [Fe3+] [SON ] When we increase Reactant ; then K neaction will - product in order Set the Equilibrium concentration of lises I decreases) tend to form more to increase K &. 1 addition of KSON KSCN

Concentration of SCN addition of KSON .. proceed in FORWARD order to form more Date: is increased on reaction will direction in product 4) Fe(NO → Fe3+ + 3 NO More Fest & FORWARD direction (iii) Naf Nattf - No common ion added . ho effect (IV) Hot Water bath As forward reaction is exothermic backward reaction is endothermic A is favoured at to high temperatur hot water bath favours BACKWARD reaction tv Cold Water bath farcours FORWARD reaction - Cock, 12 + 6H₂O 2 [ColH₂O)]²+ + 40 la + heat

Date: Reach Forward Backward Exothermic endothenis (1) - Addition Hee of - the H+ cu - ce concentration increases & More product - tend to from more reactants - BACKWARD Reaction favored sii) Ho (more reactant) = favours mox product formation FORWARD REACTION AgNO No change (1) GN) Hot Water Bath : Favours endothumic Reaction i.e. BACKWARD REACTION - (V) Cold Water Bath favours Exothermic Reaction i.e FORWARD REACTION