What is the hydrogen ion concentration of a solution with a ph = 8.25?

The concentration of H⁺ Ions can be calculated using following formula,

                                        pH  =  -log [H⁺]
or,
                                       -pH  =  log [H⁺]
Now, Solving for [H⁺],
                                        [H⁺]  =  10⁻⁽pH⁾
Putting value of pH,
                                        [H⁺]  =  10⁻⁽⁸·²⁵⁾

                                        [H⁺]  =  5.62 × 10⁻⁹ M

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.

The teacher is mostly talking about the distillation of a mixture