What is the pH of a solution if the #[H^+] = 3.45 * 10^-9 M?# Chemistry Acids and Bases pH calculations 1 Answer anor277 Jan 15, 2016 #pH# #=# #-log_(10)[H^+]# Explanation: #pH# #=# #-log_(10){3.45xx10^-9}# #=# #8.5#. This value is reasonable in that since #[H^+]<10^(-7)#, the solution is slightly basic, and the #pH# of course reflects this. Answer link Related questions How do you determine ph of a solution? How do you determine pH at an equivalence point? How do you determine pH from molarity? What does alkalinity mean? What is a base? How do acid base indicators change color? What is a neutral pH? How does alkalinity affect pool water? Why is pH important in drinking water? How can I calculate the pH of a solution? See all questions in pH calculations Impact of this question 3502 views around the world You can reuse this answer Creative Commons License