Final answer:
A substance with a pH of 13 is 10 to the power of 6 times more basic than pure water, which has a neutral pH of 7.
Step-by-step explanation:
If the pH of a substance is 13, it means that the substance is highly basic or alkaline. Pure water has a neutral pH of 7. The pH scale is logarithmic, which means that each whole pH value below 7 is ten times more acidic than the next higher value and each whole pH value above 7 is ten times more basic than the next lower value.
Therefore, a pH difference of 6 (pH 13 minus pH 7) indicates that the substance with a pH of 13 is 106 times more basic than pure water.