10 Rewrite the net ionic equation to inc Part III. Dissolution of ammonium chlor

Question

10 Rewrite the net ionic equation to inc Part III. Dissolution of ammonium chloride in water Section A Initial appearance of equilibrium mixture I. clear Change aner addition ofeone.HCl 2· cloud What 3. Change after heating misture for 3-4 min: Cl-eAr Change after cooling mixture: 4. Sesrtin BClody Whitt Observations of dissolution of solid NH&Cl; in water The dissotion is Cold, Conclusions 5. The equation for the dissolution ofNHCl in water is: NHaci (s)?NH' (aq) + cr (aq) Write the equilibrium expression for the equation. NHA 6. In terms of Le Châtelier's principle, explain the change you observed on adding the concentrated HCI to the initial solution. 7. Is the dissolution of solid NH CI in water an exothermic or endothermic process? What experimental observation supports your answer? 8. Rewrite the chemical equation to include the "heat" term. 7-1

Explanation / Answer

6.

NH4Cl + H2O <=> NH4OH + HCl

if added Hcl(product side), according to Lechatelier principle; the reaction system will try to decrease the concentration of HCl by increasing the rate of backward reaction. That is more amount of ammonium chloride and water will form.

7.

NH4Cl <=> NH4+ + Cl-

forward reaction is endothermic and backward reaction is exothermic, because the dissolution of ammonium chloride in water will produce cold solution.

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