Question

The ph of a solution with [h3o+] = 5.9 × 10-3 m, to the correct number of significant figures, is

Answer 1

The  Ph of  a solution  with (H3O+) =  5.9  x10 ^-3M  is  calculated   as  below

Ph=  - Log  (H3O+)  concentration

that is Ph= -Log  ( 5.9  x10^-3)  =  2.2

the  solution is acidic since the  Ph is  less  than  7

Answer 2

pH is related to [H₃O⁺] as follow,

                                pH  =  -log [H₃O⁺]

As,
                               [H₃O⁺]  =  5.9 × 10⁻³

Putting this value in above equation,

                                pH  =  -log (5.9 × 10⁻³)

                                pH  =  2.23
Result:
          As the pH of given concentration of H₃O⁺ ions is less than 7, so it is acidic in nature.