formulas of some of the acids include HCL, HNO3, H2SO4. these acids are very soluble in water. what will happen when these acids dissociate in water, and what will be the resulting change in pH of the solution?

Spontaneity tell us the direction of the reaction, but not how fast it goes. gibbs free energy brings together enthalpy, entropy and temperature in one easy formula. g = h - ts. and, finally the sign of delta g is always negative for a spontaneous reaction.