Question

CHEMISTRY AID URGENT

Answer 1

pOH is the negative logarithm of hydroxide ion concentration in the solution. Lower pOH values, less than 7 denote that the solution is basic, higher pOH value, greater than 7 indicate an acidic solution.

`pOH = - log[OH^(-)]`

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

Given the pOH of solution is 3.90.

Calculating the concentration of hydroxide ions,
`[OH^(-)]` from pOH:

`pOH = - log[OH^(-)]`

`3.90 = - log[OH^(-)]`

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

`[OH^(-)] = 10^(-3.90)`

=
`1.3 * 10^(-4) M`

Therefore the hydroxide ion concentration of the solution will be
`1.3 * 10^(-4) M`