(28) Is the dissolution of NIH Cl exothermic or endothermic? (29) Write the chem

Question

(28) Is the dissolution of NIH Cl exothermic or endothermic? (29) Write the chemical equation for the dissolution of Ni1,CI in water t, if any, experimental evidence do you have that the equilibrium is affected by the addition of HCI solution? Briefly explain. (30) What 131) Are your observation and explanation in (30) consistent with Le Châtelier's principle? Briefly explain (32) What, if any, experimental evidence do you have that the equilibrium is affected by changes in temperature? Briefly explain (33) Are your observation and explanation in (32) consistent with Le Chatelie's prnciple (34) Write the chemical equation for the dissolution of NHCI in water, including hea 53

Explanation / Answer

28)

Endothermic

29)

NH4Cl(s) + H2O(l) <------> NH4+(aq) + Cl-(aq)

30)

Solubility of NH4Cl in water decreasing

this is due to commen ion effect of Cl-

NH4Cl(s) + H2O(l) <-------> NH4+(aq) + Cl-(aq)

Equillibrium constant , K = [ NH4+ ] [ Cl- ]

So, when excess Cl- added from HCl , the equillibrium is shift to the left to maintain the equillibrium constant. So, the solubility of NH4Cl decreasing

31) Yes this experimental evidence and explanation are consistant with Le chatlier principle

Le chatlier principle is saying that when a sress like change in concentration, pressure, temperature and Volume ,the equillibrium is adjust itself by moving toward forward or backward reaction

So, if Concentration of Cl- is changed , then the equillibrium adjust itself by moving backward direction to consume the excess concentration of Cl-

32)

Solubility of NH4Cl increased as the temperature increased

Dissolution of NH4Cl is endothermic reaction , endothermic reaction is favoured by temperature

32) Yes; observation and explanation is consistant with Le chatlier pronciple

see section 31

34)

NH4Cl(s) <----> NH4+(aq) + Cl-(aq) H=+14.7kJ/mol

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