Ammonium cation NH 4 dissociate in diluted aqueous solution according to the scheme: NH4+H20→→→→→→→→ NH3 + H30* At 25 °C ammonium cation has pKA = 9.245 and its standard dissociation enthalpy AH = 52.01 kJ mol¹¹. a) Is the dissociation of ammonium cation exothermic or endothermic? b) Consider, without calculation, if ammonia (NH3) is stronger or weaker base at higher temperature. c) Calculate PKA of the ammonium cation at 70 °C. d) Calculate AG and AS of dissociation at 25 °C.
Ammonium cation NH 4 dissociate in diluted aqueous solution according to the scheme: NH4+H20→→→→→→→→ NH3 + H30* At 25 °C ammonium cation has pKA = 9.245 and its standard dissociation enthalpy AH = 52.01 kJ mol¹¹. a) Is the dissociation of ammonium cation exothermic or endothermic? b) Consider, without calculation, if ammonia (NH3) is stronger or weaker base at higher temperature. c) Calculate PKA of the ammonium cation at 70 °C. d) Calculate AG and AS of dissociation at 25 °C.
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![Ammonium cation NH 4 dissociate in diluted aqueous solution according to the scheme:
NH4+H2O
NH3 + H30*
At 25 °C ammonium cation has pKA = 9.245 and its standard dissociation enthalpy
AH = 52.01 kJ mol¹¹.
a) Is the dissociation of ammonium cation exothermic or endothermic?
b) Consider, without calculation, if ammonia (NH3) is stronger or weaker base at higher
temperature.
c) Calculate PKA of the ammonium cation at 70 °C.
d) Calculate AG and AS of dissociation at 25 °C.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fdcb5ed51-dc83-4a6c-a755-4edf3cf07d96%2Ff6de9a99-97ce-4e6d-9f33-dc8816bf47fb%2Ft43qkv_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Ammonium cation NH 4 dissociate in diluted aqueous solution according to the scheme:
NH4+H2O
NH3 + H30*
At 25 °C ammonium cation has pKA = 9.245 and its standard dissociation enthalpy
AH = 52.01 kJ mol¹¹.
a) Is the dissociation of ammonium cation exothermic or endothermic?
b) Consider, without calculation, if ammonia (NH3) is stronger or weaker base at higher
temperature.
c) Calculate PKA of the ammonium cation at 70 °C.
d) Calculate AG and AS of dissociation at 25 °C.
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