How much does pH intensity increase by for every number moved away from 7?

The correct answer indicates that for every unit moved away from a neutral pH of 7, the intensity of pH increases by 10 times. This is due to the logarithmic nature of the pH scale, which is based on the concentration of hydrogen ions in a solution.

On the pH scale, each whole number change represents a tenfold change in acidity or alkalinity. For instance, moving from a pH of 7 to pH 6 means the solution is 10 times more acidic, and moving from pH 7 to pH 5 indicates it's 100 times more acidic, as each step represents a tenfold increase in concentration.

Thus, every step away from the neutral point of 7 causes a tenfold increase in hydrogen ion concentration, reinforcing the understanding that pH is a logarithmic scale, making the correct answer accurate in representing this significant increase with each movement away from neutrality.