Question

In a certain acidic solution at 25 degrees Celsius, [H+] is 100 times greater than [OH-]. What is the value for [OH-] for the solution ?

Answer 1

`["OH"^-]=1xx10^6` `"M"`

Explanation:

We have `["H"^+]=100["OH"^-]` at `25^@sf(C)`. We also know that, at `25^@sfC`, `"K"_"w"=1xx10^14` and that `"K"_"w"-=["H"^+]["OH"^-]`

`["H"^+]["OH"^-]=100["OH"^-]^2=1xx10^14` `"M"`

`["OH"^-]^2=1xx10^12` `"M"`

`["OH"^-]=1xx10^6` `"M"`