Because of high value of hydration energy.
Because of high of heat of Hydration of HF ( Fluoride ion is extensively hydrated because of it's small size )
delta Hr is the enthalphy change of a reaction delta Hf is the enthalpy of formation where one mole of a substance is formed ( generally in its naturally occurring physical state) delta Hc is the enthalpy of combustion where one mole of a substance in its standard state undergoes combustion delta Hn is the enthalpy of neutralization where one mole of H+ reacts with OH- to form one mole of H2O delta Ha is the enthalpy of atomization where a molecule splits to form its neutral atomic components
Nats.
The Enthalpy of neutralization of all strong acids are almost the same. It is between -58 to -59 kilojoules per mole.
the aim of a thermometric titration is to determine the concentration of the titrand and also to calculate the enthalpy change of neutralization.
H2(g) + S(s) —> H2S + 20.6 kJ
-1282.5J
2C(s) + 2H2(g) + 52.5 kJ -> C2H4
H2(g) + S(s) H2S + 20.6 kJ
2C(s) + 2H2(g) + 52.5 kJ -> C2H4
I would say heartburn when someone takes Calcium Carbonate to neutralize stomach acid and relieve burning.
C(s) + 2S(s) + 89.4 kJ --> CS2(l)