Cobalt blue 2. Color change after addition of distilled water: Light PINk 3. Col

Question

Cobalt blue 2. Color change after addition of distilled water: Light PINk 3. Color change after addition of conc. HCl: Indigo Blue olor change after heating mixture: cobalt Blue Color change after cooling mixture: 5. Lignt PurPHe Conclusions 6. The net ionic equation for the equilibrium between [CoCla?and [Co(H2O)6]2's: Write the equilibrium expression for the equation. LCOGLA 7. After the water was added to the initial equilibrium mixture, what was the primary twe ada wotercreactant), wnich will cumbine with cobs and themor tCoCt20),7at are formed, means initial Co resent? Explain your answer centrated HCl was added? Explain this using Le Châtelier' What happened to the mixture when con principle. adding Hclyneans ei ions ari adding. So according t0 Le Chatelier's prinpk reaction wil Shitt to reatant ide and attain new 8. Based on what you observed on heating and cooling the mixture, is the forward reaction in this equilibrium endothermic or exothermic? Explain your answer. 9. 7-6

Explanation / Answer

9.

The color of [CoCl4]2- is blue

The color of [Co(H2O)6]2+ is pink

SInce it is given that,

on heating it turns towards blue and on cooling it turns towards pink/purple.

According to lechatlier;s principle heating will shift the equilibirum towards endothermic side.

SO, formation of [CoCl4]2- should be endothermic as on heating it turns towards blue color.

Hence, on heating the equilibrium is shifted towards backward direction i.e. reactants side.

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