Question

What is the concentration of `OH^-` ions in a solution that contains `1 times 10^-3` `M` `H^+`?

Answer 1

`color(blue)[["OH"^-]]=color(blue)[1xx10^-11" M"`

Explanation:

At `"25"^@"C"`,

`color(white)(----)color(magenta)[["OH"^-]["H"_3stackrel"+""O"]]=color(magenta)[1xx10^-14" M"^2]`

If `["H"_3stackrel"+""O"] = 1xx10^-3" M"` then...

• `color(magenta)(["OH"^-]["H"_3stackrel"+""O"])=color(magenta)[1xx10^-14" M"^2]`
• `["OH"^-][ 1xx10^-3" M"]=1xx10^-14" M"^2`
• `["OH"^-]=(1xx10^-14" M"^cancel2)/[ 1xx10^-3cancel" M"]`
• `color(blue)[["OH"^-]]=color(blue)[1xx10^-11" M"`