113 (28) Is the dissolution of NIH,Cl exothermie or endothermic? (29) Write the

Question

113 (28) Is the dissolution of NIH,Cl exothermie or endothermic? (29) Write the chemical equation for the dissolution of NH,CI in water (30) What, if any, experimental evidence do you have that the equilibrium is affected by the addition of HCI solution? Briefly explain (31) 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 Chatelier's principle? Briefly explain. 34) Write the chemical equation for the dissolution of NH,CI in water, including heat. in water, including heat

Explanation / Answer

Q28

NH4Cl dissolution must be endthermic, since it decreases the solutions temperature and requires heat to dissolve as well

Q29

NH4Cl(s) = NH4+(aq) + Cl-(aq)

Q30

if we add HCl --> there will be solid NH4Cl formation, due to the decrease in solubility

NH4Cl(s) must preciptite and go to the bottom as a solid

Q31

Yes, they are, recall that Lechatelier must always favour the coutnerbalance of the system due to outside effects in equilbirium

Q32

if we increase T, then we add heat, then this becomes more spontaneous, i.e. more soluble

Q33

Yes, since the ysstem requires heat to dissolve, then addition of heat via increase in T will dissolve material

Q34

NH4Cl(s) + heat = NH4+(aq) + Cl-(aq)

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