Knowing that the initial concentration of phosphoric acid within a pool is 0.3mg. L-¹, and considering the equilibrium constants and the equilibrium expressions placed in the figure, determine the concentration of all specific species in 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.