BIOLOGY question #5?

Question

A solution with a pH of 2 has a hydrogen ion concentration that is _______ the hydrogen ion concentration of a solution with a pH of 4.

a)1/2

b)1/100

c)two times

d)ten times

e)one hundred times

could you tell me how you got this?

and no you aren't doing my homework i'm studying for a quiz tomorrow and these are the questions from the textbook.

Answer 1

The correct answer is E.

The pH scale is an a logarithmic scale. This means that with each interval change in pH, there is a 10 fold difference in the acidity level. so in this example:

a solution with a pH of 2 is 10 times more acidic than that of a solution with a pH of 3

a solution with a pH of 3 is 10 time more acidic than that of a solution with a pH of 4

therefore a solution with a pH of 2 is 100 times more acidic that that of a solution with a pH of 4.

(10*10=100)

Answer 2

the correct answer is e because each level you go up in pH scale, the hydrogen concentration is 10 times less. Therefore pH of 2 has 100 times more hydrogen ions than in the solution of pH of 4.

it cannot be (a) because pH doesn't work that way if 2 is half of four therefore it must have half as much