Question

Determine the hydroxide ion concentration in a solution that is: 1 × 10-4 M HCl. (kw = 1.0 X10-14)

Answer 1

Answer: The hydroxide ion concentration in a solution is
`1* 10^(10)M`

Step-by-step explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration.

`pH=-\log [H^+]`

`HCl\rightarrow H^++Cl^(-)`

According to stoichiometry,

1 mole of
`HCl` gives = 1 mole of
`H^+`

Thus
`1* 10^(-4)` moles of
`HCl` gives =
`(1)/(1)* 1* 10^(-4)=1* 10^(-4)` moles of
`H^+`

`K_w=[H^+][OH^-]`

`10^(-14)=[1* 10^(-4)][OH^-]`

`[OH^-]=1* 10^(10)M`

Thus the hydroxide ion concentration in a solution is
`1* 10^(10)M`