Answer:
4.29
Explanation:
I got u
So always remember that the relation between the hydrogen ion concentration and pH is the following
-log[H+] = pH, so they have an exponential/logarithmic relation depending on what you are finding, in this case logarithmic. and the opposite is 10^-pH = [H+]
so just do -log[5.1*10^-5] and you get 4.29
Extra lesson for you kid.
if the question was find pOH, then what you should know is pH + pOH = 14, so if we found pH earlier and you wanted to find pOH, just do 14-4.29
Another cool way to find this is simply knowing that hydrogen ion concentraiton x hydroxide ion conc = 1*10^-14, which is the water ionization consntant, since H+ and OH- derive from H2O
So if the question was find OH- conc from H+, just do (1*10^-14)/[H+]
Finally, I promise you, pOH and [OH-] relate the same way as earlier,
so -log[OH-] = pOH, and 10^-pOH = [OH-]
Hope that answered your question