If the hydroxide ion concentration is #3.5 × 10^"-5"color(white)(l)"mol/L"#, what are the pH and the hydrogen ion concentration? Chemistry Acids and Bases pH calculations 1 Answer Ernest Z. Jul 21, 2017 #"pH = 9.54; [H"^"+"] = 2.86 × 10^"-10"color(white)(l) "mol/L"# Explanation: #["OH"^"-"] = 3.5 × 10^"-5"color(white)(l) "mol/L"# #"pOH = -log"["OH"^"-"] = "-log"(3.5 × 10^"-5") = 4.46# #"pH = 14.00 - pOH = 14.00 - 4.46 = 9.54"# #["H"^"+"] = 10^"-pH"color(white)(l) "mol/L" = 10^"-9.54" color(white)(l)"mol/L" = 2.86 × 10^"-10"color(white)(l) "mol/L"# 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 6819 views around the world You can reuse this answer Creative Commons License