Question

If I have I have hydrogen-ion concentration of 2.3x10^-3, what is the hydroxide-ion concentration?

Answer 1

4.2 X
`10^(-12)` moles/litre is the hydroxide ion concentration of the solution if hydrogen-ion concentration of 2.3x
`10^(-3)`.

Step-by-step explanation:

Data given:

hydrogen ion concentration = 2.3 X
`10^(-3)`

Hydroxide ion concentration =?

first the pH of the solution is calculated by using the formula:

pH = - log[
`H^(+)`]

Putting the values in the equation,

pH = -
`log_(10)` [2.3 X
`10^(-3)`]

pH = 2.63

Now from the relation we will find the pOH of the solution:

14 = pOH + pH

14 - pH = pOH

14 - 2.63 = pOH

11.37 = pOH

now using the formula to calculate OH ions in the solution as:

pOH = -
`log_(10)` [
`OH^(-)`]

[
`OH^(-)`] =
`(1)/(10^(pOH) )`

= 4.2 X
`10^(-12)` moles/litre is the hydroxide ion concentration of the solution.