"how many fold difference is the hydrogen ion concentration if the ph is 6.7 is increased to 8.7"

pH of the solution is calculated using the following formula:

Here, is concentration of hydrogen ion.

Initial value of pH is 6.7, calculate concentration of hydrogen ion from this as follows:

Putting the value,

Thus, initial concentration of hydrogen ion is .

Now, final pH value is 8.7, calculate concentration of hydrogen ion as follows:

Thus, final concentration of hydrogen ion is .

The ratio of final to initial value will be:

Thus, if pH increases from 6.7 to 8.7, concentration of hydrogen ion becomes of the initial value.

the answer to this question is 3.

i think its 100.

hope this !