Question

Calculate the [OH−] of each aqueous solution with the following [H3O+]:blood, 4.5×10−8M

Answer 1

2.22 x 10⁻⁷ M

Procedure

To calculate the [OH⁻] concentration of blood we will consider the following pH formulas

pH=-log [H₃O⁺]

pH+pOH=14

The pH of blood will be

`pH=-\log_(10)[4.5*10^(-8)M]=7.3467`

Then we do the rest

`pOH=14-7.3467=6.6532`

Lastly, we transform from pOH to concentration

`[OH^-]=10^(-pOH)=10^(-6.6532)=2.22*10^(-7)`