If a precipitation reaction occurs, what will be the products of the unbalanced reaction shown below?
Pb(NO3)2(aq) + K2(SO4)(aq)

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.

Electrical charges of ionic bonds