A high number on the pH scale means the solution is more alkaline (basic).

Here's a breakdown:

* pH scale: Ranges from 0 to 14.

* Neutral: pH 7 is neutral (like pure water).

* Acidic: Numbers below 7 indicate increasing acidity (think of lemon juice).

* Alkaline (basic): Numbers above 7 indicate increasing alkalinity (think of baking soda solution).

So, a pH of 13 is much more alkaline than a pH of 8.