# Concentration of hydroxide ions

• harambe

## Homework Statement

The hydroxide ion concentration in an aques H2CO3 solution is 4X10^{-4}M at 25°C OH- ion concentration in the solution is

## Homework Equations

Ph=log(H+ or OH-) [/B]

## The Attempt at a Solution

I calculated the PH of H+ in the solution which came to be 4.3979.Considering this to be water solution , I get POH to be 10.602..This doesn't match answer. Where did I go wrong[/B]

which came to be 4.3979

Note: you are showing way too many figures in your results. 4.4 would do here (and would be exactly as wrong as what you wrote).

Don't forget to tell us what the question is. Given the concentration of hydroxide ion calculate the OH- concentration is the easiest question I've seen here yet.

• Chestermiller
Don't forget to tell us what the question is. Given the concentration of hydroxide ion calculate the OH- concentration is the easiest question I've seen here yet.
Who is the George Washington bridge named after?

• epenguin
Who is the George Washington bridge named after?

GW?