A decrease of one unit in the pH scale above represents a tenfold increase in the hydrogen ion concentration of a solution. For example, a solution having a pH of 4 is 10 times more acidic than a solution with a pH of 5. If acid precipitation rain changes the pH of a pond from 7.5 to 6.5, the level of hydrogen ion has changed by a factor of
A) 2.0
B) 10
C) 13.0
D) 100
E) 0.01

The level of hydrogen ion has increased by a factor of 10.

Explanation:

We know,

where represents concentration of in molarity

Here

So,

Here

So,

Hence, change in pH =  =

So, the level of hydrogen ion has increased by a factor of 10.

Option (B) is correct

what is the general relationship between a galaxy's distance from earth and its speed?

the answer is:

the farther away a galaxy is from us, the faster it is moving away from us.

hurricanes form when warm, moist air from the ocean surface quickly rises into the atmosphere and forms storm clouds and rain. when the clouds are formed, heat is released which warms the cool air in the upper regions of the atmosphere so that the cycle can continue. which two phases of the water cycle are repeated in this process?