Understanding pH

* pH Scale: The pH scale measures the acidity or alkalinity of a solution. It ranges from 0 to 14, with:

* 0-6: Acidic

* 7: Neutral

* 8-14: Alkaline (Basic)

* Logarithmic Scale: The pH scale is logarithmic, meaning each whole number change in pH represents a tenfold change in acidity or alkalinity. For example:

* A pH of 3 is 10 times more acidic than a pH of 4.

* A pH of 11 is 10 times more alkaline than a pH of 10.

The Problem

You're asking:

* A solution with a pH of 4 is 10 times more acidic than a solution with a pH of 5.

* How many times more acidic is a solution with a pH of 4 compared to a solution with a pH of 6?

Solution

1. From pH 4 to pH 5: We know a pH of 4 is 10 times more acidic than a pH of 5.

2. From pH 5 to pH 6: Each whole number change on the pH scale represents a 10-fold change in acidity. So, a pH of 5 is 10 times more acidic than a pH of 6.

3. Combined Change: To go from pH 4 to pH 6, we've moved two steps on the pH scale. Since each step is a 10-fold change, the total change is: 10 * 10 = 100

Answer: A solution with a pH of 4 is 100 times more acidic than a solution with a pH of 6.