Achemist is using a solution of hno3 that has a ph of 3.75.

what is [h+] for the solution?

⇒ *1.78* × 10^n m
n = *-4*

okay so i don't get chemistry and i'm getting a tutor eventually. the blank is what i had to fill in and the arrows are pointing to a number in as-tricks these are the correct answer. however i wish for an explanation. on where this number came from i know i'm suppose to use a calculator and i know i use the "log" button however what do i throw in it. (err 75 points instead of cause i don't just want an answer just a logical explanation. you so much! )